🔍 Read the full analysis: The 5X Divide: AI Subscription Price Or Subsidy? on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis measured usage limits across major AI subscriptions and estimates that Claude plans provide about 5.4 to 5.6 times the API-priced usage of comparable ChatGPT plans on its tested mid-tier models and workload. The report also says OpenAI recently cut allowances on its $200 plan, while price and limit changes at both companies have shifted subscription value. The estimates depend on a specific agentic workload and do not establish how much typical subscribers use.
SemiAnalysis has compared usage limits across major AI subscriptions by measuring how their usage bars move per million tokens and pricing the resulting usage at API list rates. On its tested agentic workload, the analysis estimates that Claude plans offer about 5.4 to 5.6 times the API-priced usage of comparable ChatGPT plans at the mid-tier model level, as OpenAI has recently reduced allowances on its $200 plan.
The report compares Claude Opus 5.5 with GPT-6.1 Sol for an agentic workload resembling coding-agent use. SemiAnalysis says the workload is dominated by cached input: roughly 96.6% cached input, 2.6% cache writes, 0.4% fresh input and 0.3% output. Its “API value” estimate prices the plan’s full monthly usage limit at each provider’s first-party API list rates; it is not a measure of a typical subscriber’s actual spending or usage.
At $20 per month, the report estimates $211 in API-priced GPT-6.1 Sol usage for ChatGPT Plus and $1,178 in Opus 5.5 usage for Claude Pro, a ratio of about 5.6 to one. At $100 and $200, it estimates ratios of about 5.4 and 5.6, respectively. Both companies’ plans return roughly the same estimated API value per subscription dollar within their own tiers: around 10.5 times the fee for OpenAI and around 58 times for Anthropic on this workload and model comparison.
SemiAnalysis says OpenAI roughly halved token allowances on its $200 plan. Existing subscribers keep their previous limits until October 29, while new purchases receive the lower allowances immediately. The report says a new $500 tier provides about 21% more Astra usage than the former $200 plan, but less Sol-class API value, and lists 300 tokens per second “Ultrafast” mode as its main distinguishing feature; testing of that mode is ongoing.
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 gap matters to subscribers deciding which plan fits their work, but the report’s estimates describe a full monthly allowance at API prices, not the cash value every customer receives. Actual results depend on model choice, token mix, how much of the allowance a person uses and restrictions on when usage can occur.
SemiAnalysis also frames the pricing as a question of inference costs and margins. It estimates subscriptions make up about 10% of Anthropic revenue while consuming more than 40% of its inference compute, reducing blended revenue per megawatt by roughly $36 million. These are the report’s estimates, rather than company-reported figures. Under its assumptions, fully using an Opus 5.5 allowance would imply a gross margin of about negative 369%; at 20% utilization, the estimate rises to about 6%. The report estimates about 1% at full Fable 5.1 usage and 80% at 20% utilization.
Those calculations help explain why subscription limits can change as models and API prices change. Lower API rates reduce the modeled dollar value of a fixed allowance. Providers can adjust token limits too, but a price cut alone does not increase how much subscribers can use.
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Recent Price and Limit Changes
SemiAnalysis says OpenAI lowered its $200 plan’s allowances last week and also cut GPT-6.1 Sol’s cached-input API price. It reports that Sol’s API-equivalent value fell by more than half on the plan, reflecting the price change as well as the allowance change. It also says OpenAI removed “5x more usage” and “20x more usage” comparisons from its pricing page. One difference remains: the report says OpenAI Pro plans lack Claude’s five-hour usage window, which may let heavy users spend more of their monthly allowance in bursts.
Anthropic has cut API prices on its models, too. According to SemiAnalysis, Fable 5.1 reduced cache-read prices by 75% compared with Fable 5, without an increase to its token limits. Opus 5.5 cut input and output prices by 20% and cache reads by 60% against Opus 5; the report says allowances rose about 20% on Max and about 50% on Pro, but not enough to offset the price reductions in its API-value calculation. It reports a similar pattern for OpenAI’s Sol model: no corresponding limit increase when GPT-6.1 Sol launched.
The comparison is not a simple ranking of all plans or tasks. At the frontier tier, SemiAnalysis says GPT-6 Astra and Claude Fable 5.1 have broadly similar limits. Its example for $200 plans estimates the Astra allowance at about $2,897 in API prices, while Fable would use roughly half of a Claude plan’s limit at $2,485, leaving the rest available for Opus or Sonnet. The report says the mid-tier comparison is where use of those other models widens the modeled difference.
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Usage and Cost Assumptions
The reported ratios depend on one agentic workload, selected models and API list prices. The source material does not establish how often subscribers use their full limits, how usage patterns vary across customers, or whether the estimated API prices match the cost of serving each plan. SemiAnalysis’s margin figures rely on assumptions including 92% API gross margins and stated utilization rates.
The report also says testing of OpenAI’s 300-token-per-second Ultrafast mode is continuing. It is not yet clear how that mode performs in ordinary use, or how much the October 29 change will affect existing subscribers once their prior limits end. The comparison cannot by itself show which plan is better for a particular user or task.
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Plan Limits After October 29
The next clear date in the report is October 29, when existing $200 ChatGPT Pro subscribers are due to lose access to their grandfathered allowances and move to the new limits. SemiAnalysis says it is still testing the $500 plan’s Ultrafast mode; further reporting on that performance could clarify what the higher-priced tier adds in practice.
For subscribers tracking value, the relevant developments are any new changes to monthly token limits, model prices and usage windows. The report’s comparison may shift if providers change those terms, and its API-equivalent figures should be read against the workload and price assumptions used in each update.
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Key Questions
What does the reported 5.4 to 5.6 times gap measure?
It compares the estimated API list-price value of full monthly usage allowances for Claude and ChatGPT on SemiAnalysis’s tested agentic workload and selected mid-tier models. It does not mean every subscriber gets that much practical value.
What changed on OpenAI’s $200 plan?
SemiAnalysis says OpenAI roughly halved its token allowances. New purchases receive the lower limits immediately, while existing subscribers retain their prior limits until October 29.
Did Anthropic raise limits when it cut API prices?
The report says Fable 5.1 launched without higher token limits. Opus 5.5 allowances rose by about 20% on Max and 50% on Pro, but SemiAnalysis estimates those increases did not fully offset the API price cuts.
Does the comparison show which subscription is best?
No. The figures depend on a particular token mix, models, list prices and full use of monthly allowances. A subscriber’s needs, actual usage and any time-based usage limits can change which plan suits them.
Source: ThorstenMeyerAI.com
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