🔍 Read the full analysis: Why The 5X Is A Subsidy, Not The Real Price Of AI Subscriptions on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis measured AI subscription usage against API list prices and estimated that Claude plans return about 5.4 to 5.6 times as much API-equivalent value as comparable ChatGPT plans on its tested agentic workload. The report also documents recent changes to plan limits and token prices, and estimates that heavy subscription use can weigh substantially on providers’ inference economics. The ratios depend on the tested models, workload and usage assumptions, and may change as providers revise prices and limits.
SemiAnalysis compared AI subscription usage limits with the cost of buying equivalent tokens at API list prices, estimating that Claude plans deliver about 5.4 to 5.6 times the API-equivalent value of similarly priced ChatGPT plans on a tested coding-agent workload. The comparison comes as OpenAI has cut limits on its $200 plan and introduced a $500 tier, changes that make the report’s central point as much about shifting plan terms as about the headline ratio.
The analysis tested Claude, ChatGPT and several other providers by tracking how subscription usage bars moved across token types, then pricing the measured use at each provider’s API list rates. Its central side-by-side comparison used Claude Opus 5.5 and GPT-6.1 Sol. For a $20 monthly plan, SemiAnalysis estimated $1,178 in API-equivalent use for Claude Pro and $211 for ChatGPT Plus. At $100, it estimated $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.
Those figures apply to the report’s agentic workload, which it describes as heavily cached: approximately 96.6% cached input, alongside 0.4% fresh input, 2.6% cache writes and 0.3% output. SemiAnalysis says the dollar gap remains large when comparing raw token counts, though Opus costs more per API token than Sol. The report also finds broadly similar limits for the frontier models Astra and Fable 5.1. Fable, however, can use only half of a Claude plan’s allowance, leaving the other half available for Opus or Sonnet.
SemiAnalysis reports that OpenAI roughly halved allowances across model tiers on its $200 plan. Existing subscribers keep previous limits until October 29; new subscribers receive the lower limits immediately. OpenAI also added a $500 tier. The report estimates it offers about 21% more Astra usage than the former $200 plan, while returning less Sol-class API value after Sol’s cached-input price was cut. The new tier’s stated selling point is an Ultrafast mode rated at 300 tokens per second, which SemiAnalysis says it is 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.
The Cost Behind Heavy Usage
The comparison matters because subscription allowances represent provider compute costs as well as customer value. SemiAnalysis estimates that subscriptions account for about 10% of Anthropic revenue but can use more than 40% of its inference compute, lowering blended revenue per megawatt by roughly $36 million under its estimates. It says subscriptions are a larger share of OpenAI revenue, though the supplied material gives no comparable percentage for OpenAI.
The report models the economics under different usage assumptions. If a subscriber fully uses an Opus 5.5 allowance, SemiAnalysis estimates a gross margin of about −369% for Anthropic on that plan, assuming 92% API gross margins. Its estimate for a fully used Fable 5.1 allowance is about 1%. At 20% average utilization, those modeled margins rise to about 6% for Opus and 80% for Fable. These are estimates based on the report’s assumptions, not disclosed audited margins for individual subscription plans.
For customers, the practical value of a plan can change when either its allowance or token pricing changes. A lower API price reduces the calculated dollar value of a fixed allowance; a plan limit cut reduces how much a subscriber can use. That means a provider’s price reduction does not automatically increase the amount included in a subscription.
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How Plan Value Has Shifted
SemiAnalysis’s estimate converts a plan’s full monthly limit into API list-price dollars. It is a way to compare what the same measured tokens would cost through an API, rather than a cash refund or a guarantee that each subscriber will consume the full allowance. The resulting ratio depends on the model, token mix, pricing and actual usage.
The report says OpenAI’s earlier Pro tiers offered progressively more Astra value per dollar, while the revised Pro 100, 200 and 500 tiers return similar tokens per dollar. OpenAI also removed the “5x more usage” and “20x more usage” comparisons from its pricing page, according to the analysis. The report identifies one practical difference: ChatGPT Pro plans do not impose a five-hour usage window, which can help people who need to use more of their allowance in a short period.
Anthropic also reduced API prices for newer models, while changing subscription allowances by different amounts. SemiAnalysis says Fable 5.1’s cache-read price fell 75% from Fable 5 without a corresponding increase in limits. Opus 5.5’s input and output prices fell 20%, and cache reads fell 60%; its reported allowance rose about 20% on Max and 50% on Pro. The report says those increases did not fully offset the price cuts in API-equivalent value. It also says OpenAI did not increase limits when GPT-6.1 Sol launched, leaving the $200 plan’s calculated value about 30% lower after a price change.
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Limits of the Value Estimate
The reported ratios are not universal measures of what every subscriber receives. They reflect one agentic workload, particular model versions, observed usage-bar behavior and API list prices at the time of the analysis. The supplied source does not give a full account of how representative that workload is of typical subscriber use, or how often customers reach their plan limits.
The financial estimates also depend on assumptions, including utilization and API gross margins. The source material does not provide audited plan-level costs or revenue figures from either company. It remains unclear how long the current allowances will stay in place, whether providers will change limits again, and how the still-testing Ultrafast mode performs in ordinary use.
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Watch for Further Plan Changes
For existing subscribers on OpenAI’s $200 plan, the stated transition point for the reduced limits is October 29. New purchases already receive the lower allowances, according to the report. SemiAnalysis says it is still testing the $500 tier’s 300-token-per-second Ultrafast mode, so its performance and practical value remain to be established.
Further comparisons will depend on whether OpenAI and Anthropic change model prices, included limits or plan rules. Readers weighing the plans should check the current allowance and any usage windows alongside the model they expect to use; the API-equivalent figures can shift when any of those terms change.
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Key Questions
What does the reported 5x value gap measure?
It compares the estimated API list-price cost of tokens available under similarly priced plans on SemiAnalysis’s tested agentic workload. It is not a cash value paid to subscribers.
Which plans were compared?
The central comparison used Claude Opus 5.5 against GPT-6.1 Sol across $20, $100 and $200 monthly plan levels. The report also discusses frontier models and other providers.
Did OpenAI change its $200 plan limits?
SemiAnalysis says OpenAI roughly halved the allowances across model tiers. Existing subscribers retain their previous limits until October 29, while new purchases receive the reduced limits immediately.
Does the report prove Anthropic loses money on every subscription?
No. Its margin figures are estimates under specified assumptions, including a fully used allowance or 20% average utilization. They do not establish the margin on every customer or the company’s audited plan-level results.
Why can an API price cut reduce subscription value?
If the subscription allowance stays fixed, fewer API-price dollars correspond to the same token usage after the API price falls. The calculated API-equivalent value therefore declines unless the provider also raises the included limit.
Source: ThorstenMeyerAI.com
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