🔍 Read the full analysis: The 5X And The True Cost Question For AI Subscriptions on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis compared usage limits across major AI subscriptions by tracking token consumption and pricing equivalent usage at providers’ API rates. Its analysis estimates Claude plans offer about 5.4 to 5.6 times ChatGPT’s API-equivalent value on the mid-tier models examined, but also finds that pricing changes, usage limits and expensive model use shape the real value and cost.
AI research firm SemiAnalysis has compared subscription usage limits across major providers by measuring how much different kinds of token use consume from each plan, then pricing that usage at API list rates. In its comparison of Claude Opus 5.5 and GPT-6.1 Sol on an agentic coding workload, it estimates Claude plans provide about 5.4 to 5.6 times ChatGPT’s API-equivalent value at comparable monthly prices—a gap that comes with substantial potential inference costs and can shift when providers change limits or API prices.
SemiAnalysis tested plans from Anthropic and OpenAI, as well as offerings from Meta, SpaceXAI, Cursor, Cognition, Z.ai, MiniMax and Moonshot. Its method tracked usage by token type, including fresh input, cached input, cache writes and output. The resulting dollar amounts are estimates of what the measured usage would cost at each provider’s first-party API list prices, not cash rebates or guarantees that subscribers will use their full allowance.
For the workload in its central comparison, SemiAnalysis says roughly 96.6% of tokens were cached input, with about 0.4% fresh input, 2.6% cache writes and 0.3% output. It estimates a $20 Claude Pro plan’s allowance at about $1,178 in API-equivalent usage, compared with roughly $211 for ChatGPT Plus. At the $100 and $200 tiers, its estimates are $5,725 and $11,726 for Claude, against $1,055 and $2,084 for ChatGPT. These comparisons use Opus 5.5 and Sol; the report says the difference remains large when measured in raw tokens, though the models have different per-token prices.
The report also describes a recent OpenAI allowance reduction: token limits for the examined model tiers were roughly halved, according to SemiAnalysis. Existing subscribers to the $200 plan keep their previous limits until October 29, while new buyers receive the lower limits immediately. OpenAI also introduced a $500 tier. SemiAnalysis estimates it provides about 21% more Astra usage than the old $200 plan, and less Sol-class API-equivalent value, while highlighting an Ultrafast mode rated at 300 tokens per second that the firm says it is 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.
The Economics Behind Generous Plans
The comparison matters because a subscription’s advertised price does not by itself show how much use a customer can get—or what that use costs the provider. SemiAnalysis estimates that subscriptions make up about 10% of Anthropic revenue but can consume more than 40% of its inference compute. On its rough calculation, this lowers blended revenue per megawatt by about $36 million. The report says subscriptions account for a larger share of OpenAI revenue, though it does not give a comparable figure in the supplied analysis.
The estimates also depend heavily on which model subscribers use and how often they use it. Assuming a subscriber exhausts the available allowance and using an assumed 92% API gross margin, SemiAnalysis calculates gross margins of about −369% for Opus 5.5 and about 1% for Fable 5.1. At an assumed 20% average utilization, its estimates rise to roughly 6% and 80%, respectively. These are modeled scenarios, not reported financial results. They illustrate why a headline value multiple cannot establish what the average customer receives or what a plan earns.
For customers, the practical implication is to check which models count against a plan’s limits, how usage windows work and whether the provider has changed allowances. For providers, the tension is between making subscriptions attractive and keeping the cost of serving intensive workloads manageable. SemiAnalysis’s figures suggest those trade-offs may be especially pronounced for access to the most capable models.
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How Plan Changes Shift Value
The report’s comparison reflects several model and pricing changes, not a stable measure of subscription value. SemiAnalysis says Anthropic reduced Fable 5.1 cache-read prices by 75% compared with Fable 5, without raising Fable’s token limits. It says Opus 5.5 prices for input and output fell 20%, and cache reads fell 60%, compared with Opus 5; allowances rose about 20% on Max and 50% on Pro. The report estimates those allowance increases did not fully offset the price cuts when value is measured at API rates.
It describes a similar effect for OpenAI’s Sol model: the API price fell without a corresponding increase in limits, lowering the estimated API-equivalent value of the $200 plan by about 30%. This is why lower API prices do not automatically mean a subscription customer can use more. If the plan’s token allowance stays fixed, the same quantity of tokens is worth less at the new list price.
Model choice also changes the comparison. SemiAnalysis says frontier-tier allowances for GPT-6 Astra and Claude Fable 5.1 are broadly similar. In its example, a $200 OpenAI plan’s Astra allowance corresponds to about $2,897 at API prices, while Fable usage consumes half of a Claude plan’s limit at an estimated $2,485. Claude subscribers retain the other half for Opus or Sonnet, according to the report. OpenAI plans, by contrast, have no five-hour usage window, which may matter for customers who need to use a large share of their allowance in a short period.
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Limits of the Value Comparison
The 5.4-to-5.6-times estimate applies to a specific agentic workload and model pairing, not every task or subscriber. The result depends on token mix, cached-input use, API list prices and whether a customer reaches the plan’s full allowance. SemiAnalysis says the workload is overwhelmingly cached input, so people with different usage patterns could see a different relative value.
The analysis does not establish the average utilization of subscribers, the full costs of serving each plan, or the companies’ actual margins by subscription tier. Its margin estimates rely on stated assumptions, including a 92% API gross margin, and scenarios ranging from full use to 20% utilization. It is also unclear from the supplied report how long current limits will remain in place, whether further price or allowance changes are planned, and how customers will use OpenAI’s new Ultrafast mode.
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Watch Limits and Usage Data
SemiAnalysis says it is still testing OpenAI’s 300-token-per-second Ultrafast mode, so further findings could clarify whether the $500 plan’s performance feature changes its practical appeal. The next dated change cited in the report is October 29, when existing $200 subscribers are set to lose their grandfathered limits and move to the lower allowance.
For customers comparing plans, the relevant next checks are provider updates to model-specific limits, usage windows and API prices. A more complete assessment of the 5x estimate would also require comparable data on subscriber utilization and costs across different tasks. Until then, SemiAnalysis’s figures are best read as a measured comparison under specified assumptions, rather than a universal ranking of subscription plans.
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Key Questions
What does the reported 5x figure measure?
It compares the API-list-price value of measured plan usage for Claude Opus 5.5 and GPT-6.1 Sol on a particular agentic workload. It does not mean every Claude subscriber gets five times as much practical benefit.
Which plans did SemiAnalysis compare?
The report compares $20, $100 and $200 tiers, including Claude Pro and Max plans and ChatGPT Plus and Pro plans. Its estimates cover specific models and usage assumptions, rather than every feature or task offered by each service.
Why can an API price cut reduce subscription value?
If a plan’s token allowance stays unchanged while the API price per token falls, the same amount of usage has a lower API-equivalent dollar value. A subscription’s practical allowance may not have changed, even though this comparison number has.
Are the margin figures actual company results?
No. They are SemiAnalysis estimates based on assumptions about gross margins and subscriber utilization. The report does not present them as audited or disclosed margins for the subscription plans.
When do existing OpenAI $200 subscribers get the lower limits?
SemiAnalysis says existing subscribers retain their previous limits until October 29; new purchasers receive the reduced limits immediately. The supplied material does not specify a year for that date.
Source: ThorstenMeyerAI.com
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