🔍 Read the full analysis: How SemiAnalysis Read Between The Lines Of AI Subscription Pricing on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis measured token allowances across major AI subscriptions and compared them with first-party API list prices. Its analysis estimates that Claude’s mid-tier plans provide about 5.4 to 5.6 times the API-equivalent usage of comparable ChatGPT plans, while recent limit and price changes show that the gap can shift without a change in monthly fees.
The analysis tests how subscription usage meters respond to different token types, then prices the measured allowances at each provider’s first-party API list rates. Its central comparison uses an agentic coding workload made up mostly of cached input: approximately 96.6% cached input, 2.6% cache writes, 0.4% fresh input and 0.3% output. SemiAnalysis defines “API value” as the plan’s full monthly allowance priced at those rates.
For that workload, SemiAnalysis estimates that a $20 Claude Pro plan provides about $1,178 in API-equivalent usage, compared with roughly $211 for ChatGPT Plus. At $100, its estimates are $5,725 for Claude Max 5x and $1,055 for ChatGPT Pro 100. At $200, the figures are $11,726 for Claude Max 20x and $2,084 for ChatGPT Pro 200. The resulting ratios are about 5.4 to 5.6 times, according to the report.
The report says the difference remains substantial when counted in raw tokens, which avoids comparing models with different API prices. At the frontier tier, it finds a narrower comparison: on a $200 plan, the GPT-6 Astra allowance would represent about $2,897 at API prices, while Claude Fable 5.1 would represent about $2,485. Fable can use only half of a Claude plan’s limit, however, leaving the rest for Opus or Sonnet.
SemiAnalysis also documents an OpenAI reduction to its $200 plan. It says per-model token allowances were roughly halved, and the Sol-class API-equivalent value fell by more than half after OpenAI cut the model’s cached-input price. Existing $200 subscribers retain their previous limits until 29 October; new buyers receive the lower allowances. OpenAI introduced a $500 tier, which the report says offers about 21% more Astra usage than the former $200 plan, while its main advertised distinction is an Ultrafast mode rated at 300 tokens per second. SemiAnalysis says it is still testing that mode.
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 Depends on Model Mix
The comparison matters because a plan’s advertised monthly price does not reveal how much compute a subscriber can use, or how costly that use is for the provider. SemiAnalysis estimates subscriptions account for about 10% of Anthropic revenue while consuming more than 40% of its inference compute. It says that mix reduces blended revenue per megawatt by roughly $36 million. The report characterizes subscriptions as a larger share of OpenAI revenue, though the supplied figures do not give a comparable percentage.
Heavy use of premium models can make the economics especially challenging. Using an assumption of 92% API gross margins, SemiAnalysis estimates that a subscriber who exhausts an Opus 5.5 allowance would imply a gross margin of about −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 modelled estimates, not disclosed company results, and depend on the report’s assumptions about utilization and costs.
That distinction helps explain why providers may adjust allowances as models and API prices change. A subscription can remain attractive to customers while offering very different economics depending on which models they use and how often they reach their limits. For subscribers, an API price cut does not automatically mean more included usage.
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Recent Model and Plan Changes
SemiAnalysis reports that Anthropic lowered API prices for recent models: 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. The report says Fable 5.1 launched without higher subscription token limits. Opus allowances rose by about 20% on Max and 50% on Pro, but not enough to fully offset its price reductions in the report’s API-value calculation.
OpenAI’s changes followed a similar pattern for Sol, according to SemiAnalysis: the model’s launch did not bring a corresponding limit increase, and its API-equivalent value on the $200 plan fell by about 30% after a price cut. The report says OpenAI’s Pro tiers now return roughly the same number of tokens per dollar, and that the company removed “5x more usage” and “20x more usage” comparisons from its pricing page.
One practical difference remains: SemiAnalysis says OpenAI Pro plans do not impose a five-hour usage window. That may help customers with bursty workloads use more of their monthly allowance in practice, although the report argues it does not erase the estimated API-value gap.
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Limits and Usage Still Vary
The API-equivalent figures are estimates based on measured subscription meters, selected models, a particular coding-agent token mix and published API prices. They do not establish what every subscriber will consume or the value each person will receive. The report’s numbers also depend on how providers’ usage limits behave over a full billing period.
SemiAnalysis says it is still testing OpenAI’s 300-token-per-second Ultrafast mode. The supplied source material does not include the report’s full methodology, sample sizes, or independent confirmation from OpenAI and Anthropic of the subscription cost estimates. It is also unclear whether the providers will make further allowance changes or how long current limits will remain in place.
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Watch for Further Plan Adjustments
Existing subscribers affected by OpenAI’s $200 plan change are due to retain their previous limits until 29 October, after which the lower allowances apply under the terms described by SemiAnalysis. The analysis says it is continuing to test Ultrafast mode; no results or further timing are included in the supplied material.
For customers comparing plans, the report’s findings may change as providers revise model prices, token allowances and usage rules. The next useful comparison will depend on updated measurements across the same workload and on any further plan announcements from OpenAI or Anthropic.
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Key Questions
What did SemiAnalysis measure?
It tested how usage meters moved for different token types across major AI subscriptions, then priced the measured allowances at providers’ API list rates. The central comparison uses a coding-agent workload dominated by cached input.
How large was the estimated Claude and ChatGPT gap?
For the mid-tier models and plans in its comparison, SemiAnalysis estimated Claude provided about 5.4 to 5.6 times the API-equivalent usage of similarly priced ChatGPT plans. The figure depends on the workload and pricing assumptions used.
Did OpenAI reduce limits for current subscribers?
SemiAnalysis says new buyers receive lower allowances on the $200 plan, while existing subscribers keep their previous limits until 29 October.
Does an API price cut increase subscription usage?
Not by itself. If a provider lowers the API price but leaves a subscription’s token allowance unchanged, the same allowance has a lower API-equivalent dollar value. SemiAnalysis says this happened with some recent model changes.
Are the subscription margin figures company disclosures?
No. The gross-margin figures in the report are estimates based on assumptions including a 92% API gross margin and specified subscriber utilization rates. They are not presented as company-reported subscription margins.
Source: ThorstenMeyerAI.com
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