🔍 Read the full analysis: How AI Subscriptions Hide A 5X Subsidy, According To SemiAnalysis on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis compared AI subscription usage allowances with the cost of the same tokens at providers’ API list prices. It estimates that Claude plans deliver roughly 5.4 to 5.6 times the API-equivalent value of similarly priced ChatGPT plans on a coding-agent workload, while warning that usage limits, model prices and subscriber behavior affect the comparison.
SemiAnalysis estimates that Anthropic’s Claude subscriptions provide about 5.4 to 5.6 times the API-priced usage of similarly priced ChatGPT plans for a coding-agent workload. The comparison measures how subscription usage limits move as different token types are consumed, then prices that usage at each provider’s API list rates; it is an estimate of potential value, not a measure of what typical customers actually use.
For the report’s mid-tier comparison, SemiAnalysis pairs Claude Opus 5.5 with GPT-6.1 Sol. At $20 a month, it estimates $1,178 in API-equivalent usage for Claude Pro and $211 for ChatGPT Plus. At $100, the estimates are $5,725 for Claude Max 5x and $1,055 for ChatGPT Pro 100. At $200, Claude Max 20x is estimated at $11,726, compared with $2,084 for ChatGPT Pro. Those figures produce ratios of roughly 5.4 to 5.6 times.
The workload is heavily weighted toward cached input: SemiAnalysis gives its composition as about 96.6% cached input, 2.6% cache writes, 0.4% fresh input and 0.3% output. Because Opus costs more per token than Sol at list prices, that pricing difference lifts Claude’s dollar-value estimate. SemiAnalysis says the gap remains large when comparing raw token allowances as well. Its frontier-model comparison is closer: the report says the $200 plans have broadly similar limits for GPT-6 Astra and Claude Fable 5.1, with Fable able to use only half of a Claude plan’s allowance.
The report also tracks plan changes. It says OpenAI halved allowances on its $200 plan, with existing subscribers retaining prior limits until October 29 and new purchases receiving the reduced limits. A new $500 plan offers about 21% more Astra usage than the former $200 plan, according to SemiAnalysis, while the report says the per-dollar value of OpenAI’s Pro tiers is now similar. Anthropic’s model price cuts also changed subscription value: the report says Fable 5.1’s cache-read price fell 75% without a corresponding increase in its limits, while Opus 5.5’s input and output prices fell 20% and cache reads fell 60%; Opus allowances rose, but not enough to fully offset those cuts.
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 Meets Compute Costs
The comparison matters because subscription allowances can shape both customer costs and providers’ use of computing capacity. SemiAnalysis estimates subscriptions make up about 10% of Anthropic revenue while accounting for more than 40% of its inference compute. It estimates that this mix lowers blended revenue per megawatt by about $36 million. The report says subscriptions form a larger share of OpenAI’s revenue, though the supplied material does not give a comparable percentage.
SemiAnalysis models the economics at different usage levels. Assuming a subscriber uses the full allowance and API gross margins are 92%, it estimates gross margins of about −369% for Opus 5.5 and 1% for Fable 5.1. At 20% average utilization, its modeled figures rise to about 6% and 80%, respectively. These are scenario estimates, not reported company results; actual margins depend on usage, model mix and costs.
The report’s analysis suggests providers must balance generous allowances that attract and retain users against the cost of serving them. A lower API price can also reduce the API-equivalent value of a fixed subscription allowance. That means a price cut for API customers does not necessarily increase what subscribers can use.
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Recent Price and Limit Changes
SemiAnalysis presents the ratio as a snapshot after recent changes at both companies. OpenAI reduced the allowance on its $200 plan and introduced a $500 tier. The report says OpenAI also lowered the cached-input price for GPT-6.1 Sol, so the API-equivalent value fell by more than the reduction in token allowances alone. It says OpenAI removed relative-use labels such as “5x more usage” and “20x more usage” from its pricing page.
Anthropic cut prices for newer models, but the report says subscription allowances did not always rise in step. Fable 5.1 launched without a token-limit increase, while Opus 5.5 received increases of about 20% on Max and 50% on Pro. SemiAnalysis says OpenAI did not raise Sol limits when GPT-6.1 shipped, resulting in an estimated roughly 30% drop in API-equivalent value on the $200 plan. These figures depend on the model prices and plan limits used in the report.
Plan rules also affect practical usage. SemiAnalysis says ChatGPT Pro plans do not impose a five-hour usage window, which may help people who use a large share of their allowance in short bursts. The headline ratio, however, is based on the report’s specified token mix and API list prices; it does not establish which plan is cheaper for every user or task.
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Actual Usage and Margins Remain Unknown
The estimates value a plan as though its full monthly allowance were used on a specified workload. They do not show typical subscriber utilization, the mix of models customers choose, or the realized cost and revenue of individual plans. SemiAnalysis provides a 20% utilization scenario, but the supplied material does not establish that as an observed average.
The exact value for a given customer can change with token mix, model choice, provider price changes and plan rules. The report says its comparison survives a raw-token comparison, but the supplied material does not provide the full underlying measurement data or methodology needed to independently reproduce every estimate. OpenAI’s new $500 tier also includes a 300-token-per-second “Ultrafast” mode that SemiAnalysis says it is still testing.
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Plan Terms Will Shape the Next Comparison
The next clear date in the report is October 29, when existing subscribers on OpenAI’s $200 plan are due to lose their grandfathered limits. New purchasers already receive the lower allowance, according to SemiAnalysis. The report says its testing of the new Ultrafast mode remains underway; further measurements could clarify how much that feature changes the value of OpenAI’s higher-priced tier.
For subscribers, the comparison will need to be revisited as providers change model prices, usage limits and plan features. SemiAnalysis’s estimates describe the terms and workload it examined, while the actual value to an individual will depend on how much they use and which models they select.
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Key Questions
What does SemiAnalysis mean by API-equivalent value?
It prices the subscription’s measured token allowance at the provider’s API list rates. The estimate reflects a stated workload and full use of the plan limit; it is not cash value or a prediction of a customer’s bill.
Which plans showed the largest estimated gap?
In the report’s Opus 5.5 and GPT-6.1 Sol comparison, Claude and ChatGPT tiers priced at $20, $100 and $200 showed estimated ratios of about 5.4 to 5.6 times in Claude’s favor.
Does the report show that every Claude subscriber gets five times as much value?
No. The ratio applies to SemiAnalysis’s selected coding-agent workload and its API-price method. A user’s practical value depends on token mix, model choice, usage and plan rules.
What changed for OpenAI’s $200 plan?
SemiAnalysis says OpenAI halved its allowance. Existing subscribers retain previous limits until October 29, while new purchases receive the reduced limits immediately, according to the report.
Are the subscription margin figures company-reported results?
No. They are SemiAnalysis scenario estimates based on full or 20% plan utilization and an assumed 92% API gross margin. The supplied material does not identify them as reported financial results.
Source: ThorstenMeyerAI.com
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