🔍 Read the full analysis: The 5X In AI Subscriptions: A Subsidy, Not A Price on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis’s comparison estimates that Claude subscriptions offer roughly 5.4 to 5.6 times ChatGPT’s API-equivalent value on selected mid-tier models and plans. The report also tracks recent limit and price changes at both providers, raising questions about how long generous usage allowances can last when subscriptions consume substantial inference capacity.
SemiAnalysis has published a comparison measuring how much usage major AI subscriptions provide across token types and translating those allowances into estimated API list-price value. For selected mid-tier models, it estimates that Claude plans deliver about 5.4 to 5.6 times the API-equivalent value of ChatGPT plans at matching monthly prices, while recent changes by both companies show that the gap and the value of each plan can shift as prices and limits change.
The analysis compares subscriptions from Anthropic and OpenAI alongside plans from Meta, SpaceXAI, Cursor, Cognition, Z.ai, MiniMax and Moonshot. For an agentic workload dominated by cached input, it estimates that a $20 Claude Pro plan allows usage worth about $1,178 at API list prices, compared with about $211 for ChatGPT Plus. At the $100 tier, its estimates are $5,725 for Claude Max 5x and $1,055 for ChatGPT Pro 100; at $200, $11,726 for Claude Max 20x and $2,084 for ChatGPT Pro 200.
These are estimates of the API list-price value of each plan’s full monthly allowance, not cash rebates or guaranteed savings. SemiAnalysis says the comparison uses a coding-agent workload made up of roughly 96.6% cached input, 2.6% cache writes, 0.4% fresh input and 0.3% output. It also says the gap remains large when measured in raw tokens, though the dollar comparison is affected by the different API prices of the models.
The report describes a recent reduction in OpenAI’s $200 plan: its tracked token allowances were roughly halved, and new buyers receive the lower limits immediately. Existing subscribers keep their previous limits until 29 October. OpenAI also introduced a $500 plan; SemiAnalysis estimates it offers about 21% more Astra usage than the former $200 plan, with less Sol-class API-equivalent value. The report identifies 300 tokens per second “Ultrafast” mode as a key selling point but says it is still testing that feature.
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.
The Cost of Generous Allowances
The comparison matters because the listed monthly fee alone does not show how much computing a subscriber may consume. SemiAnalysis estimates subscriptions account for about 10% of Anthropic revenue while using more than 40% of its inference compute. On its rough estimates, that mix lowers blended revenue per megawatt by about $36 million. The report says subscriptions make up a larger share of OpenAI revenue, though the supplied material gives no corresponding percentage.
The report’s margin calculations illustrate the exposure if subscribers use their full allowances. Assuming API gross margins of 92%, SemiAnalysis estimates that a subscriber who maxes out Opus 5.5 would imply a gross margin of roughly minus 369% for that plan; maxing out Fable 5.1 would imply about 1%. At 20% average utilization, its estimates rise to about 6% for Opus and 80% for Fable. These are modeled scenarios, not disclosed company results. They suggest the economics depend heavily on which models subscribers use and how much of their allowance they consume.
That creates a practical tension: generous limits can attract and retain customers, but heavy use of expensive models can make a plan costly to serve. If providers reduce allowances or change which models are included, the value customers receive can shift even while the monthly fee stays the same. The report’s central finding is consequently a snapshot of plan value, rather than a promise that today’s allowance will persist.
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How Plan Value Has Shifted
SemiAnalysis compares the plans after recent model price and subscription changes. It says OpenAI’s Pro tiers previously had more progressive value per dollar on Astra, while its latest tracking puts Pro 100, Pro 200 and Pro 500 at similar tokens per dollar. OpenAI also removed the “5x more usage” and “20x more usage” multipliers from its pricing page, according to the report. It notes that OpenAI Pro plans do not have a five-hour usage window, which may help heavy users consume more of their monthly allowance in practice.
Anthropic also reduced API prices for newer models. The report says Fable 5.1 cut cache-read prices by 75% compared with Fable 5, while Opus 5.5 cut input and output prices by 20% and cache reads by 60% compared with Opus 5. It says Fable 5.1 launched without an increase in subscription token limits; Opus allowances rose by about 20% on Max and 50% on Pro. SemiAnalysis estimates that those increases did not fully offset the lower API prices. It reports a similar effect for GPT-6.1 Sol, whose launch brought no limit change and reduced API-equivalent plan value.
These examples show why a lower API price does not automatically increase the value of a subscription. Under the report’s method, the result depends on both the price assigned to each token and the number of tokens included in a plan. The estimated value also depends on the workload’s mix of fresh input, cached input, cache writes and output, so a different usage pattern could produce different comparisons.
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Limits Behind the Estimates
The supplied source material does not include the full SemiAnalysis methodology, the exact testing dates or independent company confirmation of the allowance measurements. The API-equivalent figures depend on the workload SemiAnalysis chose and on first-party list prices; they do not establish the value every subscriber will receive. The material also does not identify the year for the 29 October deadline.
It remains unclear how often customers use their full allowances, how much usage shifts between models, and whether either company will revise limits again. SemiAnalysis’s margin figures are modeled from stated assumptions, including 92% API gross margins and specified utilization levels; the source does not present them as reported internal financial results. The report says it is still testing OpenAI’s Ultrafast mode, so its practical performance and value are not established here.
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Future Limits and Model Pricing
The next observable change identified in the report is OpenAI’s 29 October limit date, when existing $200 subscribers are due to lose their grandfathered allowances. The source does not say whether OpenAI plans further changes before or after that date. Subscribers can compare plan terms as published by each provider, but the estimates in this report should be read alongside the specific models, token mix and monthly limits used in its calculations.
Further comparisons will depend on whether providers raise allowances when they lower API prices, how new models are assigned to subscription tiers, and whether usage windows or speed features change. SemiAnalysis’s testing of Ultrafast mode may clarify one feature of the new $500 plan. Until more details are available, the report establishes a measured difference for its selected workload, while the longer-term value and cost of these subscriptions remain unsettled.
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Key Questions
What does the estimated 5.4 to 5.6 times figure measure?
It compares the estimated API list-price value of full monthly allowances on selected mid-tier plans: Claude Pro with ChatGPT Plus, Claude Max 5x with ChatGPT Pro 100, and Claude Max 20x with ChatGPT Pro 200. It is specific to the report’s workload and pricing assumptions.
Does the comparison mean Claude subscribers save that amount of money?
No. The figures estimate what the usage allowance would cost at API list prices. They are not cash savings, a refund, or a guarantee that an individual subscriber will use the full allowance.
What changed in OpenAI’s $200 plan?
SemiAnalysis says OpenAI roughly halved token allowances across model tiers. New buyers receive the lower limits immediately; existing subscribers keep their former limits until 29 October, with the year not stated in the supplied source.
Why can lower API prices reduce subscription value?
The report prices a plan’s token allowance using the model’s API list prices. If those prices fall but the plan’s token limit does not increase enough to offset the drop, the estimated API-equivalent value of the allowance also falls.
Are the report’s margin figures actual company disclosures?
No. They are SemiAnalysis estimates based on stated assumptions about API gross margins and subscriber utilization. The supplied source does not present them as reported internal financial results from Anthropic or OpenAI.
Source: ThorstenMeyerAI.com
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