🔍 Read the full analysis: How To Interpret The 5X In AI Subscription Plans on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis compared usage limits across major AI subscriptions by token type and priced the included usage at providers’ API rates. It estimates Claude’s mid-tier plans deliver roughly 5 to 6 times the API-equivalent value of comparable ChatGPT plans, but recent price and allowance changes show that ratio can shift quickly.
SemiAnalysis has compared usage limits across leading AI subscriptions, estimating that Claude’s mid-tier plans provide roughly five to six times the API-equivalent usage of similarly priced ChatGPT plans on an agentic coding workload. The result offers a way to compare plans whose limits are often presented in relative or model-specific terms, but the report says recent changes to prices and allowances make the ratio subject to change.
The comparison measures how much each service’s usage bar moves for different token types, then prices the included usage at the provider’s first-party API list rates. For an agentic workload dominated by cached input, SemiAnalysis estimates that a $20 Claude Pro plan includes about $1,178 in API-equivalent Opus 5.5 usage, compared with about $211 for ChatGPT Plus using GPT-6.1 Sol. At $100, it estimates $5,725 for Claude Max 5x and $1,055 for ChatGPT Pro 100; at $200, $11,726 for Claude Max 20x and $2,084 for ChatGPT Pro 200.
Those dollar figures are estimates of the API cost of the plan’s full monthly allowance, not cash paid to subscribers or a guarantee that every user can consume the full allowance. SemiAnalysis says the gap remains substantial when measured in raw tokens, even though Opus costs more per token than Sol. Its workload assumptions also matter: the tested coding-agent mix was roughly 96.6% cached input, with about 0.4% fresh input, 2.6% cache writes and 0.3% output.
The report describes major recent changes at both companies. OpenAI cut allowances on its $200 plan by roughly half, according to SemiAnalysis; existing subscribers keep their previous limits until October 29, while new purchases receive the lower limits immediately. OpenAI also introduced a $500 tier, which the report estimates offers about 21% more Astra than the previous $200 plan, with a headline speed mode called “Ultrafast” still under testing. Anthropic cut API prices for Fable 5.1 and Opus 5.5, while changing plan allowances by different amounts for each model.
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 Can Shift
The 5-to-6-times estimate matters to customers comparing plans, especially developers whose coding agents make heavy use of cached tokens. Yet API-equivalent value is not the same as practical value: subscribers may not use their full allowance, and model choice, usage windows and workload mix affect how much they can actually consume. OpenAI’s plans have no five-hour usage window, a practical advantage for users who need to spend their allowance in bursts, SemiAnalysis says.
The report also connects generous limits to provider economics. SemiAnalysis estimates subscriptions account for about 10% of Anthropic revenue while consuming more than 40% of its inference compute. It estimates that a fully used Opus 5.5 plan could have a gross margin near negative 369%, assuming 92% API gross margins; at 20% average utilization, its estimate rises to about 6%. These are the report’s modeled figures, not audited company disclosures. They help explain why providers may adjust allowances as model prices and costs change.
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Prices and Limits Move Together
Subscription plans bundle access to models with usage limits, while API services charge by token type. Comparing them therefore requires assumptions about which models and tokens subscribers use. SemiAnalysis’s method translates plan limits into estimated API list-price equivalents, letting readers compare tiers on a common basis. The result is tied to the tested workload and the listed prices and limits at the time of measurement.
The report describes a pattern across both companies: lower API prices do not automatically mean subscribers get more usage. Anthropic’s Fable 5.1 reduced cache-read prices by 75% compared with Fable 5, while its token limits did not rise, according to SemiAnalysis. Opus 5.5 cut input and output prices by 20% and cache-read prices by 60%; allowances rose about 20% on Max and 50% on Pro, the report says, so the API-equivalent value still fell. OpenAI’s GPT-6.1 Sol also launched without a reported limit increase, and SemiAnalysis estimates its API-equivalent value on the $200 plan dropped about 30% after a cached-input price cut.
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The Ratio Depends on Use
The estimates depend on the workload mix, model selected, usage limits and API list prices in effect when the comparison was made. A user focused on frontier models may see a narrower gap: SemiAnalysis says GPT-6 Astra and Claude Fable 5.1 have broadly similar limits, and Fable can use only half of a Claude plan’s allowance. The report’s figures do not establish what an individual subscriber will spend or how much usage will be available at peak times.
It is also unclear how long current allowances will last. Providers can change prices, model access and limits, and the source material does not establish a schedule for future revisions. SemiAnalysis was still testing OpenAI’s Ultrafast mode. The estimates of subscription margins and compute use are based on the report’s assumptions, rather than public audited figures from either company.
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Watch Allowance Changes
The next date specified in the report is October 29, when the grandfathering period for existing $200 ChatGPT subscribers is due to end. New buyers already receive the reduced allowance, according to SemiAnalysis. Further comparison will depend on whether OpenAI publishes details from Ultrafast testing, and whether either company changes subscription limits alongside future API price or model updates.
For readers deciding between plans, the most useful check is the current model-specific limit and the workload it covers. The report’s 5-to-6-times figure describes one measured comparison at a particular point in time; it should be revisited as providers revise their prices and allowances.
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Key Questions
What does “five to six times the API-equivalent value” mean?
It means SemiAnalysis estimates that pricing a plan’s full tested allowance at the provider’s API list rates would produce about five to six times the plan fee for Claude’s mid-tier plans versus comparable ChatGPT plans. It is an estimate based on usage limits and a specified workload.
Does that mean a Claude subscriber saves five times as much?
No. The figure compares estimated API list-price value with subscription fees. It does not show each customer’s actual spending, savings or ability to use the entire allowance.
Why can the comparison change?
Providers can change API prices, subscription limits and model access. SemiAnalysis says recent price reductions were not always matched by equal allowance increases, changing the estimated API-equivalent value.
When do existing $200 ChatGPT subscribers get the reduced limits?
SemiAnalysis says existing subscribers keep their previous limits until October 29. New purchases receive the reduced limits immediately.
Source: ThorstenMeyerAI.com
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