🔍 Read the full analysis: What SemiAnalysis Says The 5X Means For AI Subscription Costs on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis compared usage limits across major AI subscriptions by measuring token allowances and pricing equivalent usage at API list rates. On one coding-agent workload, its estimates put Claude’s mid-tier plans at about 5.4 to 5.6 times the API-equivalent value of comparable ChatGPT plans, while recent model price cuts and plan-limit changes have reduced value for subscribers.
The report compares Claude Opus 5.5 with GPT-6.1 Sol for an agentic workload dominated by cached input. SemiAnalysis says its “API value” figures price a plan’s full monthly usage allowance using each provider’s published API rates. On that basis, the $20 Claude Pro plan corresponds to about $1,178 in API usage, compared with about $211 for ChatGPT Plus. The report estimates similar ratios for the $100 and $200 tiers: roughly 5.4 to 5.6 times in Claude’s favor.
Those dollar figures depend on the selected models, workload mix, list prices and the assumption that subscribers use their full allowances. SemiAnalysis says the difference remains substantial when comparing raw token counts, although the report’s headline ratio is not a universal measure of what every subscriber receives. Its separate frontier-model comparison is closer: GPT-6 Astra and Claude Fable 5.1 have broadly similar allowances in the report’s test. Fable can use only half of a Claude plan’s limit, leaving the rest for Opus or Sonnet.
The report also tracks recent changes. SemiAnalysis says OpenAI roughly halved allowances on its $200 plan; existing subscribers keep the previous limits until October 29, while new purchases receive the reduced limits immediately. OpenAI introduced a $500 tier, whose stated selling point includes a 300-token-per-second “Ultrafast” mode that SemiAnalysis says it is still testing. Anthropic cut API prices for Fable 5.1 and Opus 5.5, but the report says allowances did not rise enough to preserve all prior API-equivalent value.
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 Depends on Usage
The comparison matters because AI subscriptions bundle usage behind a fixed monthly fee, while API list prices give customers a way to estimate the cost of equivalent consumption. A large gap between those measures can make a plan attractive to people running sustained coding-agent workloads, but it does not guarantee the same value for users with different models, token mixes or usage patterns.
SemiAnalysis also frames the discounts as an economic trade-off for providers. It estimates subscriptions account for about 10% of Anthropic revenue while potentially consuming more than 40% of inference compute. The report estimates that fully using an Opus 5.5 allowance could produce a gross margin of about minus 369% under its assumptions; at 20% average utilization, its estimates are far less negative. These are modeled scenarios, not audited company results, and they show why providers may change limits as model costs and prices shift.
For subscribers, the practical consequence is that a lower API price does not automatically improve a fixed-price plan. If the allowance stays constant, the same usage is worth less when measured at the new API rate. OpenAI’s plans, according to the report, also lack a five-hour usage window, which may help people who need to consume a monthly allowance in concentrated bursts.
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How the Plans Have Changed
SemiAnalysis says the comparison covers Claude, ChatGPT and subscriptions from Meta, SpaceXAI, Cursor, Cognition, Z.ai, MiniMax and Moonshot. It measured how provider usage bars moved across token types, then translated allowances into API-priced estimates. The available source material focuses most closely on OpenAI and Anthropic.
For Anthropic, the report says Fable 5.1 reduced cache-read prices by 75% from Fable 5, while Opus 5.5 cut input and output prices by 20% and cache reads by 60% from Opus 5. SemiAnalysis says Fable 5.1 launched without higher token limits; Opus allowances rose by about 20% on Max and 50% on Pro, still short of fully matching its price reductions.
For OpenAI, SemiAnalysis says the launch of GPT-6.1 Sol came without a corresponding limit increase, reducing the $200 plan’s API-equivalent value by roughly 30% in its calculation. It also reports that the previous Pro tier ladder gave higher-value allowances at higher prices, while the new Pro 100, 200 and 500 tiers provide similar tokens per dollar. OpenAI removed “5x more usage” and “20x more usage” comparisons from its pricing page, according to the report.
Limits of the Value Estimate
The figures depend on SemiAnalysis’s measurements, each plan’s stated usage limits, API list prices and the selected workload. The source material does not provide a full methodology for independently reproducing every measurement, nor does it establish how much of each plan’s allowance a typical subscriber uses. The calculated value therefore should not be read as a guaranteed cash saving or as a comparison that applies to all tasks.
Some details are still developing. SemiAnalysis says it is testing OpenAI’s Ultrafast mode, so its practical performance and value are not established in the material provided. The report’s gross-margin estimates rely on assumptions about utilization and API margins; the source does not identify them as company-reported financial results. It is also unclear from the material how long either provider will maintain current limits as models, prices and demand change.
Providers May Revise Allowances
SemiAnalysis says it is continuing to test OpenAI’s 300-token-per-second Ultrafast mode. Subscribers can also watch for further changes to plan limits and model pricing, since the report documents cases where API prices changed without matching increases in subscription allowances. OpenAI’s stated October 29 date marks when existing $200 subscribers are due to lose their grandfathered limits; the source material does not specify further scheduled changes.
Key Questions
What does the 5.4 to 5.6 times estimate compare?
It compares the API list-price value of full monthly allowances on selected Claude and ChatGPT plans for SemiAnalysis’s coding-agent workload, centered on Claude Opus 5.5 and GPT-6.1 Sol.
Does the estimate mean every Claude subscriber gets five times more value?
No. The result depends on the workload, model, token mix, API prices and use of the full allowance. It is a measurement for the report’s chosen comparison, not a promise about each subscriber’s experience.
What changed for OpenAI’s $200 plan?
SemiAnalysis says OpenAI roughly halved its usage allowances. The report says existing subscribers keep their previous limits until October 29, while new purchases receive the lower limits immediately.
Why can an API price cut reduce subscription value?
If a plan’s token allowance stays the same while the API price per token falls, that allowance has a lower dollar value when priced at the new API rate. SemiAnalysis says this happened with recent model changes at both OpenAI and Anthropic.
Source: ThorstenMeyerAI.com
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