🔍 Read the full analysis: The 5X In AI Subscription Plans: What It Says About Pricing on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis measured usage limits across major AI subscriptions and estimates that Claude plans provide roughly 5.4 to 5.6 times the API-equivalent value of comparable ChatGPT plans on selected mid-tier models. The estimate depends on a coding-agent workload and current list prices; recent price and allowance changes show that subscription value can shift without a change to the monthly fee.
SemiAnalysis has published a comparison of usage limits across major AI subscriptions, estimating that Claude plans offer roughly 5.4 to 5.6 times the API-equivalent value of comparable ChatGPT plans on selected mid-tier models. The estimate comes as OpenAI has reduced allowances on its $200 plan and introduced a $500 tier, making the report a snapshot of pricing and limits that may change.
The report compares Claude Opus 5.5 with GPT-6.1 Sol on an agentic workload modeled on coding agents. SemiAnalysis says that workload is mostly cached input: about 96.6% cached input, 2.6% cache writes, 0.4% fresh input and 0.3% output. It estimates the API list-price value of each plan’s full monthly allowance, rather than measuring what typical subscribers spend.
At $20 a month, SemiAnalysis estimates $211 in API-equivalent GPT-6.1 Sol usage for ChatGPT Plus and $1,178 in Opus 5.5 usage for Claude Pro, a ratio of about 5.6 to 1. At $100, the estimates are $1,055 for ChatGPT Pro 100 and $5,725 for Claude Max 5x; at $200, they are $2,084 for ChatGPT Pro 200 and $11,726 for Claude Max 20x. The report says the gap remains large when counted in tokens, although its dollar comparison is affected by the models’ different API prices.
SemiAnalysis also describes recent changes at both companies. It says OpenAI roughly halved token allowances on its $200 plan, while cutting GPT-6.1 Sol’s cached-input price; existing subscribers keep the previous limits until 29 October, while new purchases receive the lower limits immediately. Anthropic reduced API prices for Fable 5.1 and Opus 5.5, but the report says Fable’s token limits did not rise and Opus allowances rose by about 20% on Max and 50% on Pro.
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 suggests that monthly fees alone do not reveal how much model usage a plan includes. A change in API list prices can reduce the calculated value of a fixed allowance, even if the subscription price and token limit stay the same. For subscribers choosing a plan, the relevant trade-off includes the models they can access, their actual usage, and restrictions on when usage is available.
The report also points to a business tension for AI providers. SemiAnalysis estimates subscriptions account for about 10% of Anthropic revenue while consuming more than 40% of its inference compute, based on its own rough estimates. It calculates sharply different margins depending on usage and model choice: at full use, it estimates about negative 369% gross margin for Opus 5.5 and about 1% for Fable 5.1; at 20% average utilization, it estimates about 6% and 80%, respectively. These are modeled figures, not company-reported results, and depend on the report’s assumptions.
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Recent Changes Alter the Comparison
SemiAnalysis says both providers have adjusted API prices and subscription allowances. It reports that OpenAI’s Pro tiers now return similar tokens per dollar, while the company removed “5x more usage” and “20x more usage” multipliers from its pricing page. The report also says no ChatGPT Pro plan has a five-hour usage window, which can let heavy users draw down more of a monthly allowance in a short period.
At the frontier-model tier, the comparison is closer. SemiAnalysis says a $200 ChatGPT plan’s Astra allowance is exhausted at about $2,897 in API list-price usage. The same-priced Claude plan’s Fable allowance represents about $2,485, but Fable can use only half of the plan’s limit; the remaining share is available for Opus or Sonnet. This allocation makes a single headline ratio an incomplete guide to every user’s experience.
OpenAI’s new $500 tier reportedly offers about 21% more Astra than the former $200 plan, but less Sol-class API-equivalent value, with an advertised 300 tokens-per-second “Ultrafast” mode as a key feature. SemiAnalysis says it is still testing that mode. The report describes OpenAI’s changes after a major plan revision last week; it does not establish that current limits will remain in place.
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Limits and Real-World Use Vary
The 5.4 to 5.6 times estimate applies to specified plans, models, list prices and a coding-agent workload dominated by cached input. It is not a measure of average customer value, and the report’s dollar totals assume a subscriber uses the full monthly allowance. The comparison also does not show how many customers reach their limits or how their work divides across model tiers.
SemiAnalysis gives modeled margin estimates and rough revenue and compute shares, but the source material does not provide independently audited company figures. It also remains unclear how long the current plan limits and prices will last. The report says the new Ultrafast mode is still under testing, so its performance and practical effect on the $500 plan are not yet established.
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Watch for Further Plan Changes
The next concrete date in the report is 29 October, when existing $200 ChatGPT Pro subscribers are due to lose access to their previous allowance unless OpenAI changes the terms again. New subscribers already receive the reduced limits, according to SemiAnalysis.
Subscribers and prospective buyers can compare current plan pages and model-specific limits as providers update them. Further API price cuts, allowance adjustments or changes to the $500 tier’s Ultrafast mode could alter the report’s ratios. SemiAnalysis says it is testing that mode, but the source material gives no publication date for its results.
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Key Questions
What does the 5.6x figure measure?
It compares the estimated API list-price value of full monthly usage limits for Claude Pro and ChatGPT Plus on Opus 5.5 and GPT-6.1 Sol, using a coding-agent workload defined by SemiAnalysis. It does not measure typical subscriber spending.
Does the estimate apply to every AI model or task?
No. It is tied to selected models and a workload that SemiAnalysis says is dominated by cached input. Other models, task types and usage patterns can produce different comparisons.
When do existing $200 ChatGPT Pro limits change?
SemiAnalysis says existing subscribers keep their previous limits until 29 October. It says customers buying the plan now receive the reduced allowances immediately.
Why can an API price cut reduce subscription value?
The report calculates plan value by pricing its included usage at API list rates. If the API price falls while the token allowance stays fixed, that calculated dollar value also falls.
What is known about OpenAI’s $500 plan?
SemiAnalysis says it includes a 300 tokens-per-second Ultrafast mode and about 21% more Astra than the former $200 plan. The report says it is still testing the mode, and its practical performance has not yet been established.
Source: ThorstenMeyerAI.com
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