🔍 Read the full analysis: Why A 5X AI Subscription Is Better Understood As A Subsidy on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis’s metering study estimates that Claude subscriptions provide about 5.4 to 5.6 times the API-equivalent usage of comparable ChatGPT plans on a coding-agent workload. The report argues that this difference reflects a subsidy with significant inference costs, and says recent limit changes and model price cuts can quickly alter the value subscribers receive.
SemiAnalysis has measured usage limits across major AI subscriptions and estimates that Claude plans provide about five to six times the API-equivalent value of comparable ChatGPT plans on a coding-agent workload. The report says the gap reflects both plan limits and model pricing, while warning that recent changes show the value can shift when providers adjust prices or allowances.
For its central comparison, SemiAnalysis modeled an agentic coding workload made up largely of cached input: about 96.6% cached input, alongside roughly 0.4% fresh input, 2.6% cache writes and 0.3% output. It priced the full monthly plan allowance at each provider’s API list prices. On that basis, the $20 Claude Pro plan represented about $1,178 in API usage, compared with $211 for ChatGPT Plus. The $100 and $200 comparisons showed similar ratios, around 5.4 to 5.6 times.
The report says both providers’ plans return roughly consistent API-equivalent value per subscription dollar within their respective tiers: about 10.5 times the fee for OpenAI and about 58 times for Anthropic in this workload. SemiAnalysis also says the comparison remains wide when measured in raw tokens, though the dollar comparison is affected by Opus 5.5 costing more per token than GPT-6.1 Sol. These figures depend on the tested workload and the assumption that the full monthly allowance is used.
OpenAI’s recent changes cut allowances on its $200 plan by roughly half, according to SemiAnalysis’s tracking. Existing subscribers keep the previous limits until October 29; new purchases receive the lower limits immediately. The company also introduced a $500 tier, which the report says provides about 21% more Astra than the former $200 plan, while offering less Sol-class API-equivalent value after a Sol price cut. OpenAI’s published pricing page also removed its “5x more usage” and “20x more usage” multipliers, the report says.
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 Cost Behind High Usage Limits
The value gap matters because subscriptions can use substantial compute while bringing in a fixed monthly fee. SemiAnalysis estimates that subscriptions account for about 10% of Anthropic revenue but may consume more than 40% of its inference compute. It estimates that this mix lowers blended revenue per megawatt by roughly $36 million. These are the report’s estimates, not audited financial disclosures.
Under a scenario in which a customer uses the full allowance, the report estimates gross margins of about minus 369% for Opus 5.5 and about 1% for Fable 5.1. At 20% average utilization, its estimates rise to about 6% and 80%, respectively. The contrast suggests that the economics vary sharply by model and usage: the lower-cost model can be much less expensive to serve, while heavy use of premium models may make a plan costly for the provider.
For subscribers, a headline multiple is not a guarantee of the same value next month. Providers can change limits, model prices and which models draw down a shared allowance. The report’s comparison gives a snapshot of one workload under specific plan rules; people whose use differs, or who hit time-based caps, may see a different practical result.
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How Plan Value Has Shifted
The report’s comparison follows price and allowance changes at both companies. Anthropic cut Fable 5.1 cache-read prices by 75% compared with Fable 5, while Opus 5.5’s input and output prices fell 20% and its cache-read price fell 60% compared with Opus 5. SemiAnalysis says Fable’s launch did not raise its token limits; Opus allowances rose about 20% on Max and 50% on Pro, which did not fully offset its lower API prices in the report’s valuation.
OpenAI also lowered GPT-6.1 Sol’s cached-input price without increasing its limits, a combination SemiAnalysis says reduced the $200 plan’s API-equivalent value by about 30%. The report says the newer OpenAI tiers now return similar tokens per dollar, whereas the earlier ladder offered progressively more value at higher tiers. A practical difference remains: according to the report, OpenAI Pro plans do not have a five-hour usage window, which can matter to users who consume allowance in bursts.
At the most expensive model tier, SemiAnalysis found a narrower comparison. On a $200 plan, it estimates the OpenAI allowance would cover roughly $2,897 of GPT-6 Astra API usage, while the Claude plan would be about half-used after $2,485 of Claude Fable 5.1 usage. The report says Fable can use only half of that plan’s limit, leaving the remainder for Opus or Sonnet.
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Limits of the Value Comparison
The estimates depend on SemiAnalysis’s metering method, the selected models, API list prices and a coding-agent workload dominated by cached input. The report does not establish that every subscriber will use a full monthly allowance or see the same ratio on other tasks. The precise amount of compute consumed by subscriptions is also an estimate, not a provider-reported measure.
It is not yet clear how long current limits will remain in place or how the new $500 tier’s Ultrafast mode will affect real-world value. SemiAnalysis says it is still testing that mode, advertised at 300 tokens per second. The report also cannot show how providers may change plan limits as model costs, demand and product strategies shift.
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Further Testing of Ultrafast Mode
SemiAnalysis says it is continuing to test OpenAI’s 300-token-per-second Ultrafast mode, a central selling point of the new $500 plan. Existing $200 subscribers are scheduled to retain their previous limits until October 29, after which the terms available to them may change. Readers comparing plans will need to check the current limits and model-specific rules, since the API-equivalent estimates can move when prices or allowances change.
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Key Questions
What does “API-equivalent value” mean in the report?
It is the estimated cost of buying the plan’s full monthly usage allowance at the provider’s API list prices. It does not mean the subscriber receives that amount in cash or that every user will consume the full allowance.
Which plans did SemiAnalysis compare?
Its main comparison covered ChatGPT Plus and Claude Pro at $20 a month, the $100 tiers, and the $200 tiers, using GPT-6.1 Sol and Claude Opus 5.5 on an agentic coding workload.
Why can API price cuts lower subscription value?
If the allowance stays fixed while the API list price falls, the same tokens cost less at API rates. That reduces the plan’s API-equivalent value unless the provider also raises the usage limit.
Do the estimates show what every subscriber gets?
No. They model a particular workload and price the full allowance at list rates. Actual value depends on a subscriber’s tasks, model choices, usage and the plan limits in effect.
Source: ThorstenMeyerAI.com
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