🔍 Read the full analysis: How SemiAnalysis Interprets The 5X In AI Subscription Economics on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis compared usage limits across major AI subscriptions by measuring token consumption and pricing equivalent usage at API list rates. It estimates Claude plans offer roughly 5.4 to 5.6 times ChatGPT’s API-equivalent value on the tested mid-tier models, while recent limit and price changes show that value can shift without an obvious change in the subscription fee. The report’s margin estimates depend on usage assumptions and are not provider disclosures.
SemiAnalysis has measured usage limits across major AI subscriptions, estimating that Claude plans deliver roughly 5.4 to 5.6 times the API-equivalent value of similarly priced ChatGPT plans on the mid-tier models it tested. The comparison matters because the report also tracks recent plan and model price changes that can alter what subscribers receive without changing the monthly fee.
The report measures how far each provider’s usage bar moves when different token types are used, then prices the measured usage at first-party API list rates. Its central comparison uses Claude Opus 5.5 and GPT-6.1 Sol on an agentic workload, dominated by cached input. SemiAnalysis defines “API value” as the plan’s full monthly usage limit priced at those list rates; it is an estimate of equivalent usage, not cash returned to subscribers.
At $20 per month, SemiAnalysis estimates Claude Pro’s allowance at $1,178 in API-equivalent value, compared with $211 for ChatGPT Plus. At $100, the estimates are $5,725 for Claude Max 5x and $1,055 for ChatGPT Pro 100. At $200, they are $11,726 for Claude Max 20x and $2,084 for ChatGPT Pro 200. The report says the gap remains large when measured in raw tokens, despite Sol’s lower per-token price.
The analysis says OpenAI recently halved allowances on its $200 plan, with new purchasers receiving the lower limits immediately. Existing subscribers retain their previous limits until October 29. OpenAI also introduced a $500 tier; SemiAnalysis estimates it offers about 21% more Astra than the former $200 plan, while its selling point includes a 300-token-per-second “Ultrafast” mode that the report says it is still testing.
The 5x is a subsidy, not a price
SemiAnalysis metered the meters — every major AI subscription, token type by token type, converted to API list value. On the mid-tier models both labs call the daily driver, a Claude plan returns ~5–6× the API value of the matching ChatGPT plan. Real — and the least durable number in the report.
…and the plan is fully exhausted. One pool for every model.
…and the plan is only half used — Fable is capped at 50% of the limit, leaving the rest for Opus/Sonnet. That’s where the mid-tier gap compounds.
- $200 plan halved — Sol-class value down >50% (6.1 Sol cache price cut compounds it)
- Old limits kept until 29 October; new buyers cut immediately
- New $500 tier: only +21% Astra vs the old $200 — real draw is 300 TPS Ultrafast
- Ladder flattened: Pro 100/200/500 now identical per dollar; multipliers removed from pricing page
- In OpenAI’s favour: no 5-hour window on Pro plans — easier to use the full allowance
- Flat per-dollar value across all tiers, before and after
- New premium models placed at lower relative limits (Fable capped at 50%)
- Opus allowances raised ~20% (Max) / ~50% (Pro) with the 5.5 price cut — not enough to fully offset it
- Repeatedly walked back planned cuts earlier this year under pressure from OpenAI’s generosity
- Twelve months ago, OpenAI was the generous option. Positions swap.
Gross margin per plan, assuming 92% API gross margins. The subsidy lives almost entirely in Opus and Sonnet usage — Anthropic would already be near software-like subscription margins if everyone used only Fable. Subscriptions matter even more for OpenAI, where they’re a larger share of revenue.
Three identical subscriptions; one had ~20% lower limits. The provider (unnamed) confirmed an “extremely tiny” A/B test on limit balancing. Two lessons: limits can change silently, per account, at any time — and you won’t know without instrumentation. The usage bar is a percentage, not a contract.
If you’re choosing a plan this month for agentic coding on a mid-tier model, the report settles it: a Claude plan returns ~5–6× the API value of the matching ChatGPT plan. But a plan returning 58× its fee on a model served at a steeply negative margin for heavy users is a marketing budget with a usage meter. Value moves silently, gets A/B tested per account, and twelve months ago ran the other way. Use the subsidy while it exists — it’s genuinely large. Don’t build a cost model on it. Price workloads at API rates, keep a router between you and any one vendor, and benchmark open weights on your own hardware for steady volume. A deal you can’t verify isn’t a price. It’s weather.
Subscription Value Shifts With Limits
The measured gap bears on how users compare monthly plans, but API-equivalent value is not the same as practical value. A subscriber may not use the full allowance, may encounter product-specific limits, or may need a model that is not included in the measured workload. SemiAnalysis says OpenAI plans have no five-hour usage window, which could help users who need to consume a monthly allowance in concentrated bursts.
The report also estimates that subscriptions account for about 10% of Anthropic revenue while using more than 40% of its inference compute. Those are SemiAnalysis estimates, not figures disclosed by Anthropic. The report’s illustrative margin calculations vary sharply with utilization: at full use, it estimates about negative 369% gross margin for an Opus 5.5 plan and about 1% for a Fable 5.1 plan; at 20% average utilization, it estimates about 6% and 80%, respectively.
These estimates suggest why providers may adjust allowances as models and serving costs change. They also show why an advertised subscription multiple can be temporary: API prices, included limits, and model mix all affect the calculation.
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Recent Prices and Allowances
SemiAnalysis reports that Anthropic reduced API prices for recent models: Fable 5.1 cache reads fell 75% compared with Fable 5, while Opus 5.5 input and output prices fell 20% and cache reads 60% compared with Opus 5. The report says Fable’s subscription limits did not rise with its release. Opus allowances rose about 20% on Max and 50% on Pro, which SemiAnalysis says did not fully offset the price cuts.
It describes a similar pattern for OpenAI’s GPT-6.1 Sol: the report says the model shipped without a corresponding limit increase, and the lower cached-input price reduced the estimated API-equivalent value of the $200 plan by about 30%. OpenAI’s reductions also flattened the per-dollar value of its Pro tiers, according to the analysis. OpenAI removed “5x more usage” and “20x more usage” comparisons from its pricing page, the report says.
At the frontier tier, the comparison is closer. SemiAnalysis says a $200 OpenAI plan’s Astra allowance corresponds to roughly $2,897 at API prices, while Claude’s Fable allowance is about $2,485 and uses half of the Claude plan’s limit. The remaining allowance can be used for other models, including Opus or Sonnet.
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How Much Subscribers Actually Use
The estimates depend on a measured workload and published API prices. The report’s central test is an agentic workload with mostly cached input; results may differ for other token mixes, models, tasks, or account usage patterns. The source material does not provide enough detail here to independently reproduce every measurement or establish how representative the workload is of subscribers overall.
Actual average utilization, provider inference costs, and subscription-level gross margins have not been disclosed in the supplied material. SemiAnalysis’s margin figures are estimates under stated usage assumptions, and the source does not establish how many subscribers reach their plan limits. The eventual performance and availability of OpenAI’s Ultrafast mode also remain under testing.
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Upcoming Plan and Model Changes
The immediate date to watch is October 29, when the source says existing $200 OpenAI subscribers’ grandfathered limits end. SemiAnalysis says it is continuing to test the new Ultrafast mode; further details about its practical performance could affect how users assess the $500 tier.
For subscribers comparing plans, the next useful update will be any provider changes to included limits, model access, or API prices. Those figures can change the estimated value even when a plan’s monthly price stays the same. The source material does not identify a scheduled release date for another comparison.
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Key Questions
What does the reported 5.4 to 5.6 times figure measure?
It compares the estimated API list-price value of full monthly limits for Claude and ChatGPT mid-tier plans on SemiAnalysis’s tested agentic workload. It does not mean subscribers receive that amount as money or that every user gets the same practical value.
Which plans did SemiAnalysis compare?
The report compares $20, $100, and $200 tiers, pairing Claude Pro with ChatGPT Plus, Claude Max 5x with ChatGPT Pro 100, and Claude Max 20x with ChatGPT Pro 200.
What changed for OpenAI’s $200 plan?
SemiAnalysis says OpenAI roughly halved its token allowances. New purchases receive the lower limits immediately; existing subscribers keep their old limits until October 29, according to the source material.
Are the subscription margin figures confirmed by the companies?
No. The figures are SemiAnalysis estimates based on assumptions about plan usage and API gross margins. The source material does not provide company disclosures confirming subscription-level margins or average subscriber utilization.
Source: ThorstenMeyerAI.com
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