🔍 Read the full analysis: AI Subscriptions: Understanding The 5X Subsidy Behind The Number on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis compared major AI subscription limits with the cost of equivalent usage at providers’ API list prices. For one agentic coding workload and selected mid-tier models, it estimates Claude plans deliver about 5.4 to 5.6 times ChatGPT’s API-equivalent value; the report also finds that model price cuts can reduce subscription value when allowances do not rise.
SemiAnalysis has compared AI subscription usage limits with the cost of buying equivalent tokens at API list prices, estimating that Claude plans provide roughly 5.4 to 5.6 times ChatGPT’s value on a specified agentic coding workload using selected mid-tier models. The comparison also highlights recent changes to OpenAI allowances and the uncertain economics of plans that heavy users can consume at a loss.
The report compares Claude Opus 5.5 and GPT-6.1 Sol across three monthly price points. At $20, it estimates $1,178 in API-equivalent usage for Claude Pro and $211 for ChatGPT Plus. At $100, its figures are $5,725 for Claude Max 5x and $1,055 for ChatGPT Pro 100; at $200, $11,726 for Claude Max 20x and $2,084 for ChatGPT Pro 200. These are estimates based on the plans’ full usage limits and first-party API list prices, not cash rebates or guaranteed amounts every subscriber will use.
The workload is heavily weighted toward cached input tokens: SemiAnalysis specifies roughly 96.6% cached input, 2.6% cache writes, 0.4% fresh input and 0.3% output. The authors say the gap remains substantial when measured in raw tokens, although the dollar comparison is affected by Opus costing more per token than Sol. They also find that the frontier-model comparison is closer: the source says a $200 OpenAI plan’s Astra allowance corresponds to about $2,897 at API rates, while Fable 5.1 uses only half of a Claude plan’s limit, leaving the remainder for other models.
SemiAnalysis says OpenAI recently roughly halved allowances across model tiers on its $200 plan. Existing subscribers retain older limits until October 29, according to the report; new buyers receive the reduced limits. OpenAI also introduced a $500 tier, which the report estimates offers about 21% more Astra than the previous $200 plan, alongside a 300-token-per-second “Ultrafast” mode it says it is still testing. The source reports that OpenAI removed “5x” and “20x” relative-usage labels from its pricing page and that its Pro plans do not have Claude-style five-hour usage windows.
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 an advertised monthly price does not reveal how much usage a customer can actually draw, or what that usage costs the provider. SemiAnalysis estimates subscriptions account for about 10% of Anthropic revenue while using more than 40% of its inference compute. The report says this mix lowers blended revenue per megawatt by roughly $36 million, based on its own estimates. It says subscriptions represent a larger share of OpenAI revenue, but the supplied source gives no equivalent percentage.
The report’s margin calculations illustrate why headline value can be difficult to sustain. Assuming a subscriber fully uses the allowance and applying a 92% API gross-margin benchmark, SemiAnalysis estimates an Opus 5.5 plan could have a gross margin of about minus 369%, while a Fable 5.1 plan would be around 1%. At an assumed 20% average utilization, its estimates rise to about 6% for Opus and 80% for Fable. These are modeled scenarios, not reported company financial results; actual margins depend on usage, serving costs and the mix of models customers select.
For customers, the practical value depends on their workload, chosen model, cache usage and how quickly they use their monthly allowance. For providers, the trade-off is between attracting users with generous limits and controlling inference costs. A plan’s API-equivalent value can shrink after a model’s API price falls if its subscription allowance stays unchanged.
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Price Cuts Can Shrink Plan Value
The report describes changes by both companies to model pricing and subscription limits. Anthropic cut Fable 5.1 cache-read prices by 75% compared with Fable 5, according to SemiAnalysis, but did not increase Fable’s token limits at launch. It also cut Opus 5.5 input and output prices by 20% and cache-read prices by 60% compared with Opus 5. SemiAnalysis says Opus allowances rose by about 20% on Max and 50% on Pro, increases that did not fully offset the lower API prices in its calculations.
OpenAI’s GPT-6.1 Sol price reduction also lowered the API-equivalent value of a fixed subscription allowance, the report says. It estimates a roughly 30% decline in that value on the $200 plan after the model’s price change. The comparison’s figures therefore reflect a particular combination of model versions, API prices and plan limits, rather than a permanent ranking. SemiAnalysis says Anthropic’s five-hour usage windows can constrain bursts of use, while OpenAI’s Pro plans have no such window; that difference may affect how some customers experience the plans.
Usage and Costs Remain Uncertain
The comparison is not a direct audit of every subscriber’s experience. The supplied source does not provide the full testing protocol, the number of accounts tested, or variability across users and time. Its headline ratio relies on a specified agentic workload and API list prices; customers with different token mixes, models or usage patterns may see different results. The source says the value gap persists in raw-token terms but does not give the underlying token totals here.
The economics are also estimates. SemiAnalysis’s margin scenarios assume defined utilization levels and a 92% API gross-margin benchmark, and the supplied material does not include company disclosures confirming subscription-level margins or the revenue and compute estimates. The year for the October 29 grandfathering deadline is not specified. The source also says OpenAI’s 300-token-per-second mode is still under testing, so its availability and performance are not established by this material.
Watch Limits and Model Pricing
The next useful comparison will depend on whether OpenAI or Anthropic changes subscription allowances, model prices or access rules again. SemiAnalysis’s account says existing subscribers on OpenAI’s $200 plan retain earlier limits until October 29, while new purchases receive the reduced allowance; the source does not specify the year. OpenAI’s higher-priced tier and its reported Ultrafast mode also warrant follow-up as testing and availability become clearer.
Customers comparing plans should check the current model-specific limits and usage windows rather than relying on the 5x figure alone. Further evidence about average subscriber utilization, provider costs and plan-level margins would help establish whether the estimated subsidy reflects typical use or mainly users who regularly approach their caps.
Key Questions
What does the reported 5x subsidy mean?
It is a comparison of estimated API-equivalent usage at first-party list prices for specified plans and models. SemiAnalysis estimates a roughly 5.4-to-5.6-fold Claude advantage over ChatGPT for the selected agentic workload. It does not mean subscribers receive cash worth five times their fee or that every user will consume the full allowance.
Which plans and models were compared?
The main comparison uses Claude Opus 5.5 and GPT-6.1 Sol across $20, $100 and $200 monthly tiers. The report also discusses a frontier-model comparison involving Claude Fable 5.1 and GPT-6 Astra.
Why can an API price cut lower subscription value?
The report calculates subscription value by pricing the included token allowance at API rates. If the API price per token falls but the subscription’s token allowance does not increase, the same allowance has a lower API-equivalent dollar value.
Are the reported margins confirmed company results?
No. The margin figures are SemiAnalysis estimates based on assumptions about full or 20% utilization and a 92% API gross-margin benchmark. The supplied source does not present them as audited or company-reported subscription margins.
What should subscribers check before comparing plans?
Check the current limits for each model, any usage windows, the token mix in your work and whether limits changed after a model price update. The report’s ratio is tied to a particular workload and plan snapshot, so individual results can differ.
Source: ThorstenMeyerAI.com
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