🔍 Read the full analysis: AI Subscription Economics: The 5X Subsidy SemiAnalysis Found on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis compared AI subscription limits with the cost of equivalent API usage and estimated that Claude plans provide roughly 5.4 to 5.6 times ChatGPT’s value on a coding-agent workload using mid-tier models. The report also finds that recent price and allowance changes reduced subscription value, while heavy usage could leave providers with low or negative gross margins. Its estimates depend on measured limits, list prices and assumed usage; actual subscriber costs and utilization vary.
SemiAnalysis has published a comparison of major AI subscriptions that measures how much usage each plan allows and prices that usage at API list rates. For a coding-agent workload dominated by cached input, the report estimates that Claude’s mid-tier plans provide about 5.4 to 5.6 times the API-equivalent value of similarly priced ChatGPT plans, while warning that recent allowance and price changes are reshaping the comparison.
The report compares OpenAI’s GPT-6.1 Sol with Anthropic’s Claude Opus 5.5 across three price points. At $20 a month, it estimates $211 in API-priced Sol usage for ChatGPT Plus and $1,178 in Opus usage for Claude Pro, a ratio of about 5.6 to 1. At $100, the estimated values are $1,055 and $5,725, respectively. At $200, they are $2,084 and $11,726. These are estimates of the plans’ full monthly limits at first-party API list prices, not cash rebates or the typical value every subscriber will use.
The workload is heavily weighted toward cached input: SemiAnalysis describes it as roughly 96.6% cached input, with about 0.4% fresh input, 2.6% cache writes and 0.3% output. Since Opus costs more per token than Sol, converting each plan’s allowance into dollars makes the Claude advantage look larger. SemiAnalysis says the gap also remains substantial when comparing raw token allowances. The report says frontier-model limits are closer: on $200 plans, the Astra allowance is valued at about $2,897, while Fable 5.1 uses roughly half of Claude’s limit at an API value of $2,485. The remaining Claude allowance can go toward Opus or Sonnet.
Recent changes affected both sides of the comparison. SemiAnalysis says OpenAI roughly halved token allowances across model tiers on its $200 plan, while a cut to Sol’s cached-input API price further reduced the plan’s API-equivalent value. Existing subscribers keep their previous limits until October 29; new purchases receive the lower limits. OpenAI also introduced a $500 plan. According to the report, it provides about 21% more Astra than the former $200 plan, but less Sol-class API value, with 300 tokens per second Ultrafast mode positioned as a selling point that SemiAnalysis was 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.
Subscription Value Meets Inference Costs
The estimated value gap matters because generous limits can attract customers while making frequent use expensive to serve. SemiAnalysis estimates that subscriptions account for about 10% of Anthropic revenue but use more than 40% of its inference compute. On its rough calculations, that mix lowers blended revenue per megawatt by around $36 million. The report says subscriptions are a larger share of OpenAI revenue, though the supplied material does not give a comparable percentage.
The report’s margin estimates show why headline plan value is not the same as sustainable economics. Assuming a subscriber uses the full allowance and API gross margins are 92%, SemiAnalysis estimates a gross margin of about minus 369% on maxed-out Opus 5.5 usage and about 1% on Fable 5.1. At 20% average utilization, the estimates rise to about 6% and 80%, respectively. These are modeled outcomes under stated assumptions, not disclosed company results. Actual margins depend on how people use plans, the mix of models, and the cost of serving inference.
The report’s interpretation is that Anthropic’s low-cost-to-serve Fable usage can support much healthier subscription margins, while the largest subsidy is concentrated in Opus and Sonnet usage. OpenAI’s allowance cuts, meanwhile, bring its plan value closer to the report’s estimate for Fable. If the providers keep changing model prices without raising plan limits, subscribers can receive less API-equivalent value even when a model’s listed API price falls.
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Price Cuts Shift Plan Allowances
SemiAnalysis measured how each subscription’s usage bar moved as it sent different token types, then converted the observed limits using the providers’ API list prices. The result is specific to the models, plan limits and workload it tested. Its mid-tier comparison uses Sol and Opus 5.5; its frontier comparison uses Astra and Fable 5.1. The figures should not be read as a universal ranking across every task or user’s pattern of use.
Anthropic also cut API prices: Fable 5.1’s cache reads fell 75% versus Fable 5, while Opus 5.5 input and output prices fell 20% and cache reads fell 60% versus Opus 5. The report says Fable 5.1 launched without higher token limits. Opus allowances rose about 20% on Max and 50% on Pro, but not enough to fully match the price reductions. OpenAI, SemiAnalysis says, did not raise Sol limits when version 6.1 launched; the $200 plan’s API-equivalent value fell about 30% as a result.
OpenAI’s previous plan ladder offered increasing value per dollar at higher tiers, according to the report. After the changes, Pro 100, Pro 200 and Pro 500 return similar tokens per dollar, and the company’s pricing page no longer displays the earlier relative-usage multipliers. OpenAI plans have no five-hour usage window, which may help people who need to concentrate usage into short bursts. SemiAnalysis says that practical difference does not erase the estimated value gap, though its importance will depend on an individual’s workload.
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Limits, Usage and Margin Assumptions
The estimates do not establish how much value a typical subscriber realizes. They price the tested plan limits as if fully used, while SemiAnalysis’s margin scenarios separately model both full usage and 20% utilization. The supplied material does not include a full account of the sample size, test dates for every provider, or how consistently limits behave across accounts and regions.
Several comparisons may change as providers revise API prices, model access or subscription caps. SemiAnalysis was still testing OpenAI’s Ultrafast mode, and the material does not establish its real-world performance or whether it changes the value calculation. The report also gives no independently disclosed company data confirming its revenue, compute-use or gross-margin estimates. Those figures remain the report’s estimates and assumptions.
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Provider Limits Will Set the Next Comparison
The immediate milestone is October 29, when the previous limits expire for existing subscribers to OpenAI’s $200 plan, according to the report. New buyers already receive the lower allowances. How OpenAI presents or adjusts its $500 tier, including the Ultrafast mode still under testing by SemiAnalysis, may also affect how customers judge the new lineup.
For both providers, future API price changes and subscription limits will determine whether current value estimates hold. A lower API price can reduce the calculated value of a fixed subscription allowance; a higher allowance can offset some or all of that effect. Further measurements would be needed to show how the plans compare after those changes and across workloads beyond the cached-input-heavy coding-agent scenario.
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Key Questions
What does the reported 5.6× figure mean?
For the tested coding-agent workload, SemiAnalysis estimates that the full monthly usage limit on Claude Pro is worth about 5.6 times the ChatGPT Plus limit when each is priced at its provider’s API list rates. It is an estimate for that workload, not a cash payment or a guarantee of typical subscriber value.
Did OpenAI reduce the $200 plan’s limits?
SemiAnalysis says OpenAI roughly halved token allowances across model tiers on the $200 plan. Existing subscribers retain their old limits until October 29, while new purchases receive the lower limits immediately.
Why can a lower API price reduce subscription value?
The report calculates plan value by pricing the included token allowance at API list prices. If a provider lowers the API price but leaves the allowance unchanged, the same tokens have a lower API-equivalent dollar value.
Are the margin figures actual company results?
No. SemiAnalysis presents modeled estimates based on assumed API gross margins and subscriber utilization. The report estimates different margins at full usage and at 20% utilization; actual results depend on usage and serving costs that are not specified in the supplied material.
Source: ThorstenMeyerAI.com
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