Porter's Five Forces: What the AI Era Has Rewritten

This is one of RoadmapOne ’s articles on Strategy for Product Leaders .

Porter’s Five Forces is a framework for analysing industry structure, developed by Michael Porter in 1979. The five forces are: threat of new entrants, bargaining power of suppliers, bargaining power of buyers, threat of substitutes, and rivalry among existing competitors. Together they determine how structurally attractive an industry is to operate in. In 2026, three of the five forces have materially changed in software — threat of new entrants is effectively infinite, substitutes emerge faster, and rivalry has become asymmetric.

Michael Porter’s Five Forces, published in 1979, is the most widely-taught industry-analysis framework in history. Every MBA student has drawn it; every strategy consultant has applied it; every board paper that wants to sound rigorous has referenced it. Over forty-five years it has earned an unusual status: it remains the default way of analysing industry structure—the set of conditions that determine how attractive (or unattractive) an industry is to operate in—and no serious competing framework has displaced it.

The framework is not wrong. It is the right scaffold. But the specific answers it produces for software businesses in 2026 are materially different from the answers it produced for software businesses in 2016, and profoundly different from the industrial cases Porter originally drew on. Three of the five forces have structurally changed. One has intensified in a way Porter could not have anticipated. Two work essentially as designed. A product leader applying Five Forces in 2026 without recalibrating is doing analysis against a template that is, in three places out of five, no longer accurate.

This article walks the framework, force by force, and flags where the AI-era answers diverge from the textbook treatment. The goal isn’t to throw Five Forces out—it’s still the best scaffold we have—but to update the weights so that the diagnostic produces useful strategic direction rather than nostalgic agreement.

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What Are Porter’s Five Forces?

Porter’s framework identifies five forces that together determine the profitability of an industry:

1. Threat of New Entrants — how easily can new competitors enter the market? Low barriers to entry erode margins because new entrants arrive whenever existing margins look attractive.
2. Bargaining Power of Suppliers — how much leverage do suppliers have over the firms in this industry? Strong suppliers capture margin from the industry.
3. Bargaining Power of Buyers — how much leverage do customers have? Strong buyers (concentrated, well-informed, with low switching costs) compress margins.
4. Threat of Substitutes — how easily could buyers meet the same need through a different kind of product or service entirely? Strong substitutes cap pricing power.
5. Rivalry Among Existing Competitors — how intense is competition within the current set of players? High rivalry erodes margins through price wars, marketing spend, and capacity over-building.

Each force can be scored as high, medium, or low. The overall industry attractiveness is a composite of the five—an industry with all five forces unfavourable is a bad place to be; one with most forces favourable is a good place to be. The framework is descriptive; it tells you the terrain. What you do about the terrain is a separate strategic question (see Playing to Win and Porter’s Generic Strategies for that).

The AI-Era Reframe, Force by Force

Threat of New Entrants: Effectively Infinite

In 1979, the threat of new entrants was gated by barriers: capital requirements, access to distribution, regulatory licences, scale economies in production, proprietary know-how, brand recognition. An industry with high barriers (pharmaceuticals, aerospace, banking) had low threat of new entrants, and incumbents could charge prices that reflected the scarcity of supply.

In 2026 software, several of those barriers have collapsed. Capital requirements for building a credible product have fallen by an order of magnitude. Two engineers with AI tooling can ship something in six weeks that used to require a team of twelve for a quarter. Access to distribution is open—App Store, Product Hunt, Twitter, content-led growth, community-led growth all bypass the traditional gated channels. Proprietary know-how is less scarce because codified knowledge is instantly available to any team willing to prompt for it.

The practical consequence: the threat of new entrants is effectively infinite for most software categories. Any category with attractive margins will see new entrants arrive within months of demonstrating the attractiveness. The old question (do we have barriers to entry?) has been replaced by a new one (once new entrants arrive—and they will—what structural advantage do we have that they cannot replicate?). That question pushes strategy directly into 7 Powers territory: which of the seven structural Powers does our product actually possess?

Strategic implication: stop thinking about preventing entry and start thinking about surviving it. The roadmap capacity allocation should prioritise building Switching Costs, Network Economies, or Brand power—Powers that persist even when new entrants have full knowledge of your approach.

Threat of Substitutes: Accelerated Emergence

Substitutes—products or services from a different industry that solve the same underlying user need—have always been a threat. Netflix was a substitute for Blockbuster. Video calls are a substitute for business travel. Solar is a substitute for grid electricity.

What has changed is the speed at which substitutes appear and become credible. AI has enabled entirely new product categories—Jasper substituting for ad agencies, Cursor substituting for paired programming, Perplexity substituting for some search queries—that did not exist eighteen months before their emergence. The traditional Five Forces analysis assumed substitutes emerged slowly enough for incumbents to see them, evaluate them, and respond. In 2026, the emergence can outpace the response cycle.

Strategic implication: the analysis must treat substitute vigilance as a continuous capability, not a strategic review item. Traditional annual industry analysis produces snapshots that are obsolete before they reach the board. Substitute-scanning should be a PM-level discipline connected directly to the Wardley map — which genesis-stage capabilities in adjacent value chains could consume our product entirely? Which substitutes have crossed from custom to product while we weren’t looking?

Rivalry Among Existing Competitors: One-Sided Price War

Rivalry intensifies when competitors are numerous, similarly-sized, differentiated only on features, and unable to exit the industry cleanly. Traditional rivalry produced margin compression through competitive marketing spend, feature escalation, and selective price cuts.

In the AI era, rivalry has a new dimension: one-sided price wars. A new entrant with essentially zero sunk cost can undercut an incumbent’s pricing by 40-60% and still produce positive unit economics, because the incumbent’s pricing reflects legacy cost structure (human-dominated support, expensive sales motions, historical infrastructure) that the new entrant does not inherit. The incumbent’s margin cannot follow the new entrant’s pricing without destroying the operating model, but holding the line on pricing cedes market share. This is the dynamic playing out in multiple software categories in 2026—established players facing pricing pressure from AI-native entrants who are not operating on the same cost curve.

Strategic implication: rivalry is no longer a symmetric margin-compression dynamic. The incumbent has to decide whether to accept margin compression as a defence, or to redesign the operating model to match the new entrant’s cost structure. The second is harder and takes longer, but it is the only durable answer. A third option—find Switching Costs so strong that pricing pressure doesn’t produce churn—is often the most pragmatic.

Bargaining Power of Suppliers: Largely Unchanged

Supplier power has not been materially rewritten by AI. In software, the meaningful suppliers are cloud infrastructure (AWS, Azure, GCP), the handful of foundation-model providers (OpenAI, Anthropic, Google), and specialised tooling suppliers. The dynamics Porter described—concentration among suppliers, switching costs for the industry, forward-integration threat—apply essentially as written.

If anything, the concentration of foundation-model suppliers has increased supplier power in one narrow sense. A software category that depends on a specific AI provider’s capabilities has meaningful exposure to that provider’s pricing, availability, and model-evolution decisions. This is a new kind of supplier-power concern and should be assessed directly: what happens to our product if our foundation-model supplier triples prices, restricts API access, or deprecates the capability we depend on? The answer should shape both architectural choices (provider abstraction, multi-provider support) and strategic choices (building proprietary capability vs. remaining dependent on external suppliers).

Strategic implication: supplier analysis needs a new row—foundation-model dependency—but the basic framework applies as written.

Bargaining Power of Buyers: Mostly Unchanged

Buyer power is shaped by buyer concentration, information symmetry, switching costs, and price sensitivity. None of these has been materially altered by AI for most software categories. Large enterprise buyers remain powerful; SMB buyers remain fragmented. Information asymmetry has narrowed slightly (buyers can now reason about product capabilities faster using AI tooling), but not enough to structurally change the negotiation dynamics.

There is one AI-specific wrinkle: AI-enabled buyers can negotiate more effectively, evaluate alternatives faster, and demand more transparency in contracts. B2B buyers in particular are increasingly sophisticated in their procurement processes because they can leverage AI to do vendor analysis that previously required expensive consulting resources. This marginally increases buyer power in enterprise software deals but doesn’t change the fundamental dynamic.

Strategic implication: continue applying the traditional buyer-power analysis with no major reframing. If buyers are concentrated or well-informed, the industry will compress margins regardless of AI.

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Is Porter’s Five Forces Still Relevant?

This is the single most-searched sceptical PAA on the topic, and it deserves a direct answer: yes, with significant recalibration.

The scaffold is correct. The five forces remain the right decomposition of industry structure. The five questions are still the right questions.

The answers have shifted. Threat of new entrants in software is now effectively infinite, threat of substitutes has accelerated, and rivalry has become one-sided. Any application of Five Forces that produces the same answers it produced ten years ago is probably miscalibrated. Any application that treats the framework as obsolete is overcorrecting.

Frame it this way: Five Forces is like a medical diagnostic chart that still works but whose normal-range values have shifted. You still measure blood pressure, heart rate, and oxygen saturation—but what counts as healthy has changed. Five Forces is the same. Still measure the five forces; just recalibrate what a “favourable” reading looks like in 2026.

Five Forces vs SWOT: Which When?

This is the second most-searched question on the topic and worth addressing directly. The two frameworks answer different questions:

• Porter’s Five Forces analyses industry structure—the external environment that determines whether the industry itself is attractive to operate in. It tells you whether you’re in a good market.
• SWOT analyses company-specific position—internal strengths and weaknesses against external opportunities and threats. It tells you where you stand relative to the landscape.

They are complementary, not alternatives. A full situational assessment includes both: Five Forces to establish the industry context, SWOT to position the company within it. A company that does only Five Forces understands the market but not its own position; a company that does only SWOT understands itself but may not realise the industry is structurally unattractive.

The mistake most strategy documents make is confusing the two. Applying SWOT to answer industry questions or Five Forces to answer company-specific questions produces shallow analysis in both cases. Use each for its designed purpose.

From Diagnosis to Capacity Allocation

Five Forces is diagnostic; it tells you which force is most threatening. The operational question that should follow is: what percentage of our roadmap capacity is defending against the most threatening force?

If threat of new entrants is the dominant force in your industry, capacity should flow toward building Switching Costs, Network Economies, or Brand power—the structural defences against new entry. If threat of substitutes is dominant, capacity should flow toward monitoring adjacent categories and building integrations that deepen the workflow embedding. If rivalry is dominant, capacity should flow toward cost-structure improvements that let you match new-entrant pricing without destroying margin.

This is where the diagnosis connects to the objective tagging framework . Tag each Objective by the force it engages. Review the capacity grid quarterly. When the dominant force changes—when the threat profile shifts—the tagging makes the required capacity reallocation visible. A Five Forces analysis that produces no capacity implications is analysis theatre. A Five Forces analysis that changes the roadmap is strategy.

Pairing Five Forces with Other Strategy Frameworks

Five Forces works best as one layer in a multi-framework analysis:

• Playing to Win answers where will we play and how will we win? Five Forces informs the Where to Play choice by revealing which industries are structurally attractive.
• 7 Powers asks which Power protects us once we’ve played? Five Forces tells you which threats the Power has to defend against.
• Wardley Maps show where the terrain is moving, which is essential for substitute vigilance—the force Five Forces is weakest at tracking.
• Good Strategy Bad Strategy forces the diagnosis question: given the Five Forces assessment, what specific challenge are we engaging?

Five Forces alone produces description. Combined with the other frameworks, it produces direction. Most strategy documents stop at the description. The useful ones don’t.

Fresh Case Studies for 2026

The textbook Five Forces case studies—airlines, Blockbuster vs Netflix, Uber vs taxis—are from a different era. Fresh cases for 2026:

Jasper vs ChatGPT (2024-2026). Jasper built a successful AI-writing business positioned around the enterprise marketing workflow. ChatGPT’s arrival as a general-purpose substitute destroyed the defensive moat almost overnight. Five Forces analysis of Jasper’s industry at seed would have flagged substitute risk as moderate; the same analysis two years later shows it as catastrophic. The lesson isn’t that Jasper was badly strategised; it’s that substitute-force velocity in AI is high enough to outrun annual strategic reviews.

Figma’s Adobe deal (2022, ultimately abandoned 2023). The $20B deal was motivated partly by Adobe’s response to Figma’s blue-ocean positioning against a commoditising workflow (collaborative design). Regulatory intervention demonstrated a Five Forces dimension textbooks under-emphasise: regulatory substitutability of M&A. Not every acquisition clears. Incumbents may find defensive acquisition less available than they expect.

Cursor vs Copilot (2024-2026). Cursor’s rapid growth against Microsoft-backed Copilot shows that supplier power (both using GPT-family models) does not prevent substitute dynamics playing out at the product layer. Cursor’s workflow-first positioning built switching costs Copilot hadn’t anticipated. Five Forces on “AI coding assistants” would have looked benign; the intra-category rivalry dynamic produced a significant shift in share.

FAQ

Does Porter have 5 or 6 forces?

Michael Porter’s original 1979 framework has five forces. Various authors have since proposed a sixth force — most commonly complementors (products or services whose success amplifies your own, such as video games for a console maker), attributed most notably to Andy Grove and Adam Brandenburger. Porter himself did not adopt the sixth force. The canonical framework remains five; if complementary products are material to your industry, incorporate them as a sub-consideration within the rivalry or substitutes analysis rather than treating as a separate force.

What are Porter’s Five Forces?

Porter’s Five Forces are: (1) Threat of New Entrants — can competitors enter the market easily? (2) Bargaining Power of Suppliers — do suppliers capture industry margin? (3) Bargaining Power of Buyers — do customers compress margins? (4) Threat of Substitutes — can buyers meet the same need through a different product category? (5) Rivalry Among Existing Competitors — how intense is in-industry competition? Together the five forces determine how attractive an industry is structurally.

Who invented Porter’s Five Forces?

Michael Porter, Harvard Business School professor, published the framework in 1979 in Harvard Business Review and elaborated it in his 1980 book Competitive Strategy. It remains the most widely-taught industry-analysis framework almost fifty years later.

Is Porter’s Five Forces still relevant in the AI era?

Yes, with significant recalibration. The scaffold (five forces) remains correct. The answers have shifted: threat of new entrants is now effectively infinite for most software categories (build cost has collapsed), threat of substitutes emerges faster, and rivalry has become one-sided through zero-cost AI-native entrants. Supplier and buyer power are largely unchanged. The framework still produces useful direction if you recalibrate what “favourable” looks like.

How is Porter’s Five Forces different from SWOT?

Porter’s Five Forces analyses industry structure — is this a good market to be in? SWOT analyses company position — where do we stand relative to the landscape? They’re complementary: use Five Forces to establish the industry context, SWOT to position the company within it. Applying one framework to answer the other’s question produces shallow analysis.

What is the strongest force in Porter’s Five Forces?

It depends on the industry. In software circa 2026, threat of new entrants is usually the dominant force because build cost has collapsed. In pharmaceuticals, regulatory barriers keep threat of new entrants low and supplier power high. In airlines, rivalry is chronically intense. The analysis produces different answers by industry and by period. The useful question isn’t which force is universally strongest, but which force is most threatening in our specific industry right now, and is our roadmap defending against it?

How do I apply Porter’s Five Forces to product management?

Run the analysis for your specific industry and identify the most threatening force. Then ask: what percentage of our roadmap capacity is defending against that force? If threat of new entrants is dominant, capacity should be building Switching Costs or Network Economies . If substitutes are dominant, capacity should be on workflow embedding and substitute monitoring. Tag each Objective by force-defended-against; the tagged capacity view is the bridge from Porter’s diagnosis to the operational roadmap.

Conclusion

Porter’s Five Forces is the scaffold that industry analysis has used for forty-five years, and it remains the right scaffold in 2026. What’s changed is the answers it produces. Three of the five forces have materially shifted in the AI era—threat of new entrants is effectively infinite, threat of substitutes emerges faster, and rivalry has become one-sided. Two forces (supplier and buyer power) work essentially as Porter described them.

Product leaders who apply the framework without recalibration produce analysis that agrees with the textbook but not with the market. Leaders who recalibrate—who treat new entry as inevitable, substitute emergence as continuous, and rivalry as asymmetric—produce analyses that drive meaningful capacity decisions. The framework is diagnostic; the capacity allocation is the treatment. Done well, the Five Forces diagnosis changes the roadmap. Done poorly, it sits in a board pack and changes nothing.

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