🔍 Read the full analysis: When 5X Isn’t A Price: SemiAnalysis On AI Subscriptions on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis compared AI subscription allowances with the cost of equivalent usage at each provider’s API list prices. Its model-specific estimate puts Claude plans at about 5.4 to 5.6 times ChatGPT’s value on selected mid-tier models, while recent limit and price changes show that subscription value can shift without a change in the monthly fee.
SemiAnalysis has compared the usage limits of major AI subscriptions with what the same usage would cost at each provider’s API list prices. In its coding-agent workload comparison, Claude plans offered about 5.4 to 5.6 times the API-priced value of similarly priced ChatGPT plans on selected mid-tier models, though the report says that estimate depends on model, usage mix and current limits.
The comparison measures how subscription usage bars move as different token types are consumed, then prices the measured allowances at API rates. For an agentic coding workload, SemiAnalysis estimates that about 96.6% of tokens were cached input, with roughly 0.4% fresh input, 2.6% cache writes and 0.3% output. The report defines “API value” as the plan’s full monthly allowance priced at first-party list rates.
At $20 per month, SemiAnalysis estimates ChatGPT Plus at $211 in API-priced GPT-6.1 Sol usage and Claude Pro at $1,178 in Claude Opus 5.5 usage, a ratio of about 5.6 to one. At the $100 tier, its figures are $1,055 for ChatGPT Pro 100 and $5,725 for Claude Max 5x. At $200, the estimate is $2,084 for ChatGPT Pro 200 and $11,726 for Claude Max 20x. These are estimates based on the tested workload and stated limits, not cash refunds or guaranteed usage for every customer.
The gap is smaller at the frontier models compared in the report. SemiAnalysis says the plans have broadly similar limits for GPT-6 Astra and Claude Fable 5.1. On a $200 plan, it estimates that Astra usage could reach about $2,897 at API rates, while Fable 5.1 would use about half of Claude’s allowance, worth $2,485. The remaining Claude usage can go to other models, including Opus and Sonnet.
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 Limits Shape AI Costs
The estimates matter because a subscription’s advertised monthly price does not reveal how much compute a heavy user can consume, or how that access compares with pay-as-you-go API rates. SemiAnalysis estimates subscriptions account for about 10% of Anthropic revenue while using more than 40% of its inference compute. The report says this mix lowers blended revenue per megawatt by roughly $36 million, though its summary does not provide a detailed methodology for that estimate.
At full usage, the report estimates that an Opus 5.5 subscriber could imply a gross margin of about negative 369%, assuming 92% gross margins on API business. The corresponding estimate for Fable 5.1 is about 1%. At 20% average utilization, the report’s estimates rise to about 6% for Opus and 80% for Fable. These are model-based scenarios, not reported financial results, and show why average usage and model choice affect subscription economics.
For customers, the practical implication is that plan value can change even when the monthly fee does not. Providers can alter token limits, model prices or which models draw on a shared allowance. A high API-equivalent figure is useful for comparing a defined workload, but does not establish that every subscriber receives that value.
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Recent Changes Alter the Comparison
SemiAnalysis’s comparison reflects OpenAI changes made the week before the report. The firm says OpenAI roughly halved allowances across model tiers in its $200 plan. For Sol-class models, the API-equivalent value fell by more than half, in part because OpenAI also cut GPT-6.1 Sol’s cached-input API price. Existing $200 subscribers keep their previous limits until October 29; new purchases receive the lower limits immediately, according to the source material.
OpenAI also introduced a $500 tier. SemiAnalysis estimates it provides about 21% more Astra usage than the former $200 plan, but less Sol-class API value. Its advertised distinction is an “Ultrafast” mode of 300 tokens per second, which SemiAnalysis says it is still testing. The report says OpenAI’s Pro plans have no five-hour usage window, a feature that can matter to people who use large amounts in bursts.
Anthropic has also cut API prices. According to SemiAnalysis, Fable 5.1 reduced cache-read prices by 75% compared with Fable 5, while Opus 5.5 cut input and output prices by 20% and cache reads by 60% compared with Opus 5. The report says Fable’s token limits did not increase with its release; Opus allowances rose about 20% on Max and 50% on Pro. It says OpenAI did not raise Sol limits when GPT-6.1 shipped, contributing to a roughly 30% fall in API-equivalent value on the $200 plan.
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Usage and Margin Estimates Vary
The report’s ratios apply to a particular workload and the limits in effect at the time of measurement. Actual subscriber usage varies, and customers may distribute tokens among models with different prices and allowances. The source material does not give enough detail to independently reproduce every measurement or margin scenario.
It is also unclear how often providers will adjust limits as API prices and model costs change. The report describes recent changes, but does not establish that the same subscription value will persist. Its margin estimates rely on assumptions about utilization and API gross margins, rather than audited subscription-level results.
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Plan Changes Will Reset Comparisons
The next immediate date for affected customers is October 29, when existing $200 ChatGPT Pro subscribers are due to move to the lower limits, according to the source material. New purchasers already receive those limits. SemiAnalysis says it is still testing OpenAI’s 300-token-per-second Ultrafast mode, so its practical performance remains unsettled in the report.
Further comparison will depend on whether providers change subscription allowances alongside API prices or introduce new tiers and model-specific limits. Readers evaluating a plan should check the current allowance and eligible models: the estimates in this report describe a measured snapshot, and its ratios can change as those terms change.
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Key Questions
What does SemiAnalysis mean by API-equivalent value?
It prices the plan’s measured full monthly usage allowance at the provider’s first-party API list rates. It is an estimate for comparison, not money paid back to subscribers.
Which plans showed the largest reported gap?
For the tested coding-agent workload on GPT-6.1 Sol and Claude Opus 5.5, SemiAnalysis estimated that the $20, $100 and $200 Claude plans offered about 5.4 to 5.6 times the API-priced usage of corresponding ChatGPT plans.
Did OpenAI reduce limits for existing $200 subscribers?
The source material says existing subscribers keep their previous limits until October 29. New purchases receive the lower limits immediately.
Does the comparison show what every subscriber will use?
No. It prices measured allowances under a specified token mix. Actual value depends on a customer’s usage, model choices and the limits in force.
Source: ThorstenMeyerAI.com
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