🔍 Read the full analysis: Is AI Subscription Pricing Really 5X? A SemiAnalysis Perspective on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis estimates that Claude subscriptions provide roughly 5.4 to 5.6 times the API-priced usage of comparable ChatGPT plans on a tested coding-agent workload. The report also tracks recent allowance changes and argues that heavy use of premium models can make subscription economics difficult for providers. The figures depend on the workload, usage limits and API list prices used in the analysis.
SemiAnalysis has compared the usage limits of major AI subscriptions by measuring how provider usage bars move across token types, then pricing the estimated usage at API list rates. On a coding-agent workload dominated by cached input, it estimates that Claude plans offer about 5.4 to 5.6 times the API-priced value of comparable ChatGPT plans, a difference with potential implications for both customers and provider costs.
The report’s main comparison uses Claude Opus 5.5 and GPT-6.1 Sol on an agentic coding workload. SemiAnalysis says the workload was roughly 96.6% cached input, 2.6% cache writes, 0.4% fresh input and 0.3% output. Its “API value” is an estimate: the plan’s full monthly usage limit priced at each provider’s first-party API list rates. On that basis, the report puts the $20 Claude Pro allowance at about $1,178 in API usage, compared with $211 for ChatGPT Plus. It estimates similar ratios for the $100 and $200 tiers.
The comparison is specific to the tested workload and pricing inputs. SemiAnalysis says the gap remains large when measured in raw tokens, addressing the fact that Opus costs more per token than Sol. At the frontier tier, its comparison is closer: it estimates that a $200 ChatGPT Pro allowance represents about $2,897 of GPT-6 Astra API usage, while the Claude plan is about half-used after an estimated $2,485 of Fable 5.1 usage. The report says the other half of the Claude allowance remains available for Opus or Sonnet.
The report also tracks a recent OpenAI subscription change. It says the $200 plan’s token allowances were roughly halved, while a new $500 tier offers about 21% more Astra usage than the old $200 plan and less Sol-class API value. OpenAI’s existing $200 subscribers, according to the report, keep their previous limits until October 29; new purchases receive the lower limits. The $500 plan’s advertised 300 tokens-per-second Ultrafast mode remains under SemiAnalysis’s 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 Meets Compute Costs
The report’s central business question is whether subscribers use enough premium-model capacity to make these plans costly for providers. SemiAnalysis estimates subscriptions account for about 10% of Anthropic revenue but may use more than 40% of its inference compute. It estimates that this mix lowers blended revenue per megawatt by roughly $36 million. These are the report’s estimates; its account does not provide a complete breakdown of the underlying company figures.
To illustrate the effect of heavy use, SemiAnalysis models gross margins assuming a subscriber exhausts the plan and assuming a 92% API gross margin. Under those assumptions, it estimates a roughly negative 369% gross margin for maxed-out Opus 5.5 use and about 1% for Fable 5.1. At 20% average utilization, the modeled margins rise to about 6% and 80%, respectively. The results are scenarios, not reported subscription-level financial results, and depend on the utilization and margin assumptions.
For customers, the estimates show why a headline value ratio may not predict how much service they can actually use. Workload mix, model choice and restrictions on when usage can be spent all affect the practical allowance. SemiAnalysis says OpenAI’s Pro plans lack a five-hour usage window, which may help users who want to spend more of their monthly allotment in bursts. It judges that feature insufficient to erase the estimated value gap, while acknowledging that it can narrow the practical difference for some users.
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Recent Changes to Model Allowances
The comparison follows reductions in API prices and changes to subscription allowances at both companies. SemiAnalysis says Anthropic cut Fable 5.1 cache-read prices by 75% compared with Fable 5, without increasing Fable’s subscription token limits. It says Opus 5.5 prices fell 20% for input and output and 60% for cache reads, while allowances rose by about 20% on Max and 50% on Pro. The report says those increases did not fully offset the lower API prices in its value calculation.
For OpenAI, SemiAnalysis says GPT-6.1 Sol launched without a corresponding allowance increase, reducing the estimated API value of the $200 plan by about 30%. It also describes a flattening of the plan ladder: after the reported changes, Pro 100, 200 and 500 yield the same tokens per dollar in its calculation. OpenAI also removed “5x more usage” and “20x more usage” comparisons from its pricing page, according to the report.
These comparisons depend on published API rates and measured subscription limits, both of which can change. The report’s estimates describe the plans and model prices it examined; they do not guarantee a fixed amount of usage for every subscriber or workload.
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Limits of the Value Comparison
The 5.4 to 5.6 times estimate is not a universal measure of subscription value. It reflects one workload profile, particular models, measured usage bars, monthly limits and API list prices. The report says it tested multiple token types, but its headline comparison is centered on an agentic workload with a very high share of cached input. A user with a different balance of fresh input, cache writes and output could get a different result.
The source material does not set out enough detail to independently reproduce every measurement, including how each provider’s usage meter maps to tokens across all plans. The margin figures are also modeled scenarios based on stated assumptions, not company disclosures of subscription profitability. The extent to which individual subscribers use their full limits is unclear.
It is also not clear from the material provided whether providers will make further allowance or pricing changes, or how long the measured plan limits will remain in place. SemiAnalysis says it is still testing OpenAI’s Ultrafast mode, so its effect on the new $500 tier’s practical value has not been established in the report.
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Further Testing and Plan Changes
SemiAnalysis says testing of OpenAI’s 300 tokens-per-second Ultrafast mode is ongoing. A fuller assessment of that tier depends on how the mode performs in use and how its speed affects the value customers receive. The report does not give a final conclusion on that feature.
Customers comparing plans will need to track both allowance limits and the API prices used to calculate equivalent value. Further changes from either provider could alter the estimates, especially if subscription limits move alongside model price cuts. The report does not identify a confirmed date for any additional change.
The October 29 date is the next stated milestone for existing $200 ChatGPT Pro subscribers: SemiAnalysis says their prior limits remain until then. The material does not specify what limits those subscribers will receive afterward. Until providers publish or communicate further details, the report’s figures remain a snapshot of the plans and prices it measured.
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Key Questions
What does SemiAnalysis mean by “API value”?
It estimates the API list-price cost of the usage covered by a subscription’s full monthly limit. That is a comparison method, not cash returned to subscribers or a promise that every user can consume the entire amount.
Which plans are behind the reported 5.4 to 5.6 times gap?
The report compares Claude Pro, Claude Max 5x and Claude Max 20x with ChatGPT Plus and the $100 and $200 ChatGPT Pro tiers. Its headline result uses Opus 5.5 and GPT-6.1 Sol on an agentic coding workload.
Does the estimate apply to every kind of AI use?
No. It is tied to the tested workload, which the report says was mostly cached input, and to the plans, models, limits and API list prices it measured. Other token mixes or usage patterns may produce different comparisons.
What changed for ChatGPT Pro subscribers?
SemiAnalysis says OpenAI roughly halved the $200 plan’s token allowances and introduced a $500 tier. It reports that existing $200 subscribers retain their old limits until October 29, while new purchases receive the lower limits.
Are the subscription margin figures company results?
No. They are SemiAnalysis scenarios based on assumptions about maximum or average usage and a 92% API gross margin. The report does not present them as disclosed subscription-level margins from Anthropic or OpenAI.
Source: ThorstenMeyerAI.com
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