🔍 Read the full analysis: The Meaning Of 5X In AI Subscriptions, According To SemiAnalysis on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis compared the token allowances of major AI subscriptions with the cost of equivalent API usage. It estimates Claude’s mid-tier plans offer roughly 5.4 to 5.6 times the API-equivalent value of comparable ChatGPT plans, while warning that recent limit and API price changes can quickly shift the comparison. The report also estimates that heavy subscription use can be costly for providers, though actual subscriber usage varies.
SemiAnalysis has published a comparison of usage limits across major AI subscriptions, estimating that Claude’s mid-tier plans provide roughly 5.4 to 5.6 times the API-equivalent value of similarly priced ChatGPT plans for an agentic coding workload. The estimate compares each plan’s measured token allowance with the cost of buying the same usage at first-party API list prices; it is not a guarantee that every subscriber can reach those limits.
The report tested how subscription usage meters moved across different token types, then priced the measured allowances at the providers’ API rates. Its central comparison uses Claude Opus 5.5 and GPT-6.1 Sol. On plans priced at $20, $100 and $200 per month, SemiAnalysis estimates API-equivalent values of $1,178, $5,725 and $11,726 for Claude, compared with $211, $1,055 and $2,084 for ChatGPT. That produces ratios of about 5.4 to 5.6 to one.
The workload was heavily weighted toward cached input: the report describes it as about 96.6% cached input, with roughly 0.4% fresh input, 2.6% cache writes and 0.3% output. Because API prices differ by token type and model, the dollar comparison depends on this workload mix. SemiAnalysis says the gap remains large when measured in raw tokens, but the figures should not be read as a universal ranking for every task.
The comparison also reflects recent changes at both companies. SemiAnalysis says OpenAI roughly halved allowances on its $200 plan, while a lower cached-input price for GPT-6.1 Sol further reduced that model’s API-equivalent value. Existing subscribers were reported to retain their previous limits until October 29, while new purchases received the reduced limits. The report also describes a new $500 tier, whose stated selling point includes a 300-token-per-second “Ultrafast” mode that the authors were still 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 comparison matters because a subscription’s advertised price alone does not show how much model use it buys, and API-equivalent value can change when providers alter either allowances or API prices. SemiAnalysis’s figures suggest that Claude’s lead is concentrated in mid-tier models. At the frontier tier, its comparison finds broadly similar limits for GPT-6 Astra and Claude Fable 5.1. It estimates a $200 plan would be exhausted after about $2,897 of Astra usage at API rates, while Fable 5.1 would use about half of a Claude plan’s allowance at an estimated $2,485.
The report’s larger point is the cost to providers. SemiAnalysis estimates subscriptions account for about 10% of Anthropic revenue but may consume more than 40% of its inference compute. It estimates that this could lower blended revenue per megawatt by roughly $36 million. These are the report’s estimates, not audited company disclosures, and the supplied material does not state the measurement period or full methodology behind them.
SemiAnalysis also models margins under different usage assumptions. Assuming subscribers fully exhaust their allowances and API gross margins are 92%, it estimates a roughly negative 369% gross margin for maxed-out Opus 5.5 use and about 1% for Fable 5.1. At an assumed 20% average utilization, those modeled margins become about 6% and 80%, respectively. The scenarios illustrate how strongly economics depend on which models subscribers use and how much they use; they are not reported realized margins across all customers.
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Price Cuts Changed the Comparison
API-equivalent value combines a subscription’s measured allowance with the public API price for the tokens used. It is therefore a comparison tool, not cash value returned to a subscriber: access may be subject to usage windows, model-specific limits and other restrictions. SemiAnalysis says its estimate uses the full monthly plan limit and first-party list rates, and frames the central result around an agentic coding workload.
The report says Anthropic cut API prices for newer models without matching each cut with a corresponding increase in subscription limits. Fable 5.1’s cache-read price was reduced by 75% compared with Fable 5, while its token limits did not increase. Opus 5.5’s input and output prices fell 20%, and its cache-read price fell 60% compared with Opus 5; the report says allowances rose about 20% on Max and 50% on Pro. It estimates that Opus’s API-equivalent subscription value still declined.
For OpenAI, SemiAnalysis says GPT-6.1 Sol launched without a limit increase, while its cached-input price fell. The report estimates a roughly 30% decrease in API-equivalent value for the $200 plan as a result. It also says OpenAI removed “5x more usage” and “20x more usage” language from its pricing page. These reported changes help explain why the analysis treats the headline ratio as time-sensitive: changes to either side of the calculation can move it.
Limits and Usage Remain Variable
The supplied source material does not give the full testing protocol, sample size, or date for every measurement. It also does not establish how often subscribers reach their plan limits, whether the tested workload represents typical customer activity, or how the reported limits vary across accounts. The API-equivalent totals assume full use of the measured monthly allowance, while SemiAnalysis’s margin scenarios separately model both full use and 20% average utilization.
The ratio may also shift as providers change subscription allowances, model availability or API prices. SemiAnalysis says OpenAI grandfathered existing $200 subscribers through October 29, but the provided material does not confirm what happened to those limits after that date. The $500 plan’s Ultrafast mode was still being tested in the report, so its practical value is unresolved here.
Watch for Further Limit Changes
The next useful comparison will depend on whether the measured allowances and API rates remain in place. Readers evaluating a plan can check its current model-specific limits, any usage windows and the current API price for the token mix they expect to use. Those details determine whether the report’s ratios apply to their own work.
SemiAnalysis said it was still testing the $500 plan’s Ultrafast mode. The available source does not provide a later result or announce a date for a follow-up. Further changes to model pricing or subscription limits would also warrant a fresh measurement before treating the reported gap as current.
Key Questions
What does the reported 5.4 to 5.6 times figure mean?
It is SemiAnalysis’s estimate of how the API list-price value of measured Claude Opus 5.5 plan allowances compares with measured GPT-6.1 Sol allowances on similarly priced plans for its specified coding workload.
Does that mean Claude gives every subscriber five times more usage?
No. The ratio is tied to the models, workload mix, plan limits and API prices used in the report. Actual access depends on current plan rules and each subscriber’s usage.
Why can an API price cut lower subscription value?
The report prices subscription allowances at API list rates. If the API price falls while the allowance stays the same, the calculated dollar value of that allowance also falls.
Did OpenAI change its $200 plan?
SemiAnalysis reports that OpenAI roughly halved token allowances on the plan, with existing subscribers retaining prior limits until October 29 and new purchases receiving the reduced limits. The supplied material does not confirm the plan’s status after that date.
Are the margin estimates actual company results?
No. They are SemiAnalysis scenarios based on assumptions about API gross margins and subscriber usage. The report models full allowance use and 20% average utilization; the figures are not presented as audited realized margins.
Source: ThorstenMeyerAI.com
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