🔍 Read the full analysis: Behind AI Subscription Pricing: The 5X Subsidy Explained on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis measured usage limits across major AI subscriptions and estimated that Claude’s mid-tier plans provide about 5.4–5.6 times the API-priced usage of comparable ChatGPT plans on a coding-agent workload. The report also documents recent limit and price changes at OpenAI and Anthropic, and estimates that heavy use of premium models can make subscriptions costly to serve. Its figures depend on a particular workload, plan limits and API prices, so they do not establish the value every subscriber receives.
SemiAnalysis has compared usage limits across major AI subscriptions by measuring how provider usage bars move for different token types, then pricing the measured usage at API list rates. In its coding-agent test, the firm estimates Claude mid-tier plans deliver about 5.4 to 5.6 times the API-priced usage of similarly priced ChatGPT plans, a result that comes as both providers adjust model prices and subscription limits.
The report compares Claude Opus 5.5 with GPT-6.1 Sol on an agentic workload. SemiAnalysis says that workload was dominated by cached input: about 96.6% cached input, 2.6% cache writes, 0.4% fresh input and 0.3% output. Its “API value” measure applies first-party API list prices to the full monthly allowance measured for each plan; it is not a cash rebate or a forecast of what an individual subscriber will use.
For plans priced at $20, $100 and $200 per month, the source gives estimated API values of $1,178, $5,725 and $11,726 for Claude Pro or Max, against $211, $1,055 and $2,084 for comparable ChatGPT plans. That produces ratios of about 5.4 to 5.6 to one. SemiAnalysis says the gap remains substantial when measured in raw tokens, although the two models’ different API prices affect the dollar comparison. The report also says both companies’ tiers return roughly the same measured value per dollar within their respective plan ladders.
The report describes a recent OpenAI reduction in the $200 plan’s allowances, with existing subscribers keeping previous limits until 29 October and new customers receiving lower limits immediately. It says OpenAI introduced a $500 tier and removed “5x more usage” and “20x more usage” multipliers from its pricing page. At Anthropic, the source says Fable 5.1’s lower cache-read price came without higher limits, while Opus 5.5’s allowances rose by about 20% on Max and 50% on Pro. These are SemiAnalysis’s measurements and account of provider changes.
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 Inference Costs
The comparison matters because a subscription’s advertised monthly price does not, by itself, show how much compute a heavy user can consume. SemiAnalysis estimates subscriptions account for about 10% of Anthropic revenue while using more than 40% of its inference compute. It estimates this mix lowers blended revenue per megawatt by roughly $36 million. The report says subscriptions make up a larger share of OpenAI revenue, though the supplied material gives no corresponding percentage.
That cost pressure helps explain why providers may alter usage limits even when a new model’s API prices fall. SemiAnalysis estimates that a fully used Opus 5.5 subscription could have a gross margin of roughly negative 369%, assuming 92% API gross margins; at 20% average utilization, its estimate rises to about 6%. These are scenario calculations, not reported company results. For Fable 5.1, the report estimates about 1% at full use and 80% at 20% utilization. The figures suggest that which model subscribers choose, and how much they use it, can matter as much as the monthly fee.
For customers, the practical value depends on the workload, model choice, time limits and whether they can use their monthly allocation before it resets. The report says ChatGPT Pro has no five-hour usage window, which may help users with bursty workloads. That difference complicates a simple comparison based on the estimated API value alone.
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How the Allowances Have Shifted
SemiAnalysis says its comparison covers Claude, ChatGPT and several other AI services, including products from Meta, SpaceXAI, Cursor, Cognition, Z.ai, MiniMax and Moonshot. The supplied material contains detailed plan figures for OpenAI and Anthropic, but not comparable results for the other providers, so those services cannot be ranked here from the available data.
The source says OpenAI cut the $200 plan’s token allowances by roughly half. For Sol-class models, it estimates API-equivalent value fell by more than half because GPT-6.1 Sol’s cached-input price also decreased while the allowance did not rise. It says the new $500 plan provides about 21% more Astra than the old $200 plan, and less Sol-class API value. OpenAI’s stated selling point for that tier is an “Ultrafast” mode of 300 tokens per second; SemiAnalysis says it is still testing that feature.
Anthropic also reduced API prices for newer models, according to the report: Fable 5.1’s cache reads cost 75% less than Fable 5’s, while Opus 5.5’s input and output prices fell 20% and its cache reads 60%. SemiAnalysis says Fable’s limits did not increase, and Opus allowances rose by less than the price reductions would require to preserve the same API-priced value. The figures show why a lower API price does not automatically raise subscription value: the result also depends on how much usage the plan permits.
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Limits of the Value Comparison
The supplied material does not provide the full methodology, test repetitions or uncertainty ranges for the usage-bar measurements. It also does not establish how often typical subscribers reach their limits. API-equivalent value is a modeled comparison using list prices and measured plan allowances; it does not show each provider’s actual compute cost, subscriber satisfaction or the value of features outside token usage.
The reported 5.4-to-5.6 ratio applies to one specified coding-agent workload and the named models and plan tiers. The report says the raw-token gap is also large, but the supplied figures do not give a complete raw-token table. It is unclear how results would change across different tasks, mixes of fresh and cached input, or other model choices. The source also notes OpenAI’s higher-speed mode was still under testing, leaving its realized performance and availability unsettled.
The margin estimates depend on assumed usage and API gross margins, and the provided material does not include audited company figures or full cost calculations. Provider limits and prices can change, so the comparison describes the conditions measured by SemiAnalysis rather than a guaranteed future allowance.
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Watch for Further Plan Changes
The immediate date identified in the report is 29 October, when existing $200 ChatGPT Pro subscribers are due to lose their grandfathered limits. New buyers already receive the reduced allowance, according to SemiAnalysis. Customers comparing plans will need to check current model-specific limits and any time windows against their own workloads, since plan terms can move independently of API list prices.
SemiAnalysis says it is continuing to test OpenAI’s 300-token-per-second Ultrafast mode. Further measurements could clarify how that feature changes the practical value of the $500 tier. The report does not give a date for those results or predict whether either company will adjust limits again. The main open question is whether providers keep current allowances as model prices and inference costs change.
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Key Questions
What does the reported 5.4-to-5.6 ratio compare?
It compares the estimated API list-price value of measured monthly usage allowances for Claude and ChatGPT plans at roughly $20, $100 and $200 per month, using a coding-agent workload and named mid-tier models.
Does the comparison mean every Claude subscriber gets five times more value?
No. It is a model-based estimate for a particular workload and set of plan limits. Individual results depend on usage, model choice, input type, time windows and current plan terms.
What changed for ChatGPT Pro subscribers?
SemiAnalysis says OpenAI roughly halved allowances on the $200 plan. Existing subscribers retain the previous limits until 29 October; new purchases receive the lower limits immediately, according to the source.
Why can an API price cut reduce subscription value?
The report prices a plan’s measured usage at API list rates. If the API price per token falls and the plan allowance does not rise, the calculated API-equivalent value can decline even though the token allowance stays the same.
Are the margin figures actual company results?
No. They are SemiAnalysis estimates under stated assumptions about utilization and API gross margins. The supplied source does not present them as audited margins reported by either company.
Source: ThorstenMeyerAI.com
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