🔍 Read the full analysis: What SemiAnalysis Found Behind The 5X In AI Subscription Pricing on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis compared AI subscription usage limits with the cost of buying the same usage at API list prices. It estimates that Claude plans provide roughly 5.4 to 5.6 times the API-equivalent value of comparable ChatGPT plans on mid-tier models, while recent limit and price changes at both companies show that subscription value can shift without a change in monthly fee.
SemiAnalysis estimates that Claude subscriptions provide about 5.4 to 5.6 times the API-equivalent usage of similarly priced ChatGPT plans on the mid-tier models it compared. The report, which tracks how providers’ usage meters move across token types, also documents recent changes to OpenAI and Anthropic limits that affect the value subscribers receive.
For its agentic workload comparison, SemiAnalysis priced each plan’s full monthly allowance at first-party API list rates. At $20 a month, it estimates ChatGPT Plus offers $211 of API-priced GPT-6.1 Sol usage, compared with $1,178 for Claude Pro using Claude Opus 5.5. At $100, the reported values are $1,055 for ChatGPT Pro 100 and $5,725 for Claude Max 5x; at $200, they are $2,084 for ChatGPT Pro 200 and $11,726 for Claude Max 20x. These are modeled values at full usage, not cash payouts or guaranteed savings.
The compared workload is heavily weighted toward cached input: SemiAnalysis reports roughly 96.6% cached input, 2.6% cache writes, 0.4% fresh input and 0.3% output. Because Opus 5.5 costs more per token than Sol, the API-price comparison increases Opus’s dollar valuation. The report says the gap also remains large when measured in raw tokens. At the frontier tier, it describes the plans as closer: a $200 ChatGPT plan’s Astra allowance corresponds to about $2,897 at API prices, while Claude’s Fable 5.1 allowance is valued at $2,485 and uses half of the Claude plan’s limit.
SemiAnalysis says OpenAI recently cut the allowance on its $200 plan by roughly half and introduced a $500 tier. The new tier provides about 21% more Astra usage than the former $200 plan, according to the report, and its main differentiator is an Ultrafast mode advertised at 300 tokens per second, which SemiAnalysis says it is still testing. Existing $200 subscribers keep their previous limits until 29 October; new customers receive the reduced limits immediately. OpenAI also removed the relative-use multipliers from its pricing page, 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.
Subscription Value Meets Compute Costs
The comparison matters because a subscription’s headline price does not show how much compute a heavy user can consume. SemiAnalysis estimates that subscriptions account for about 10% of Anthropic revenue while using more than 40% of its inference compute. It says subscriptions are a larger share of OpenAI’s revenue, though it does not provide a precise figure in the supplied material.
The report’s margin estimates illustrate the tradeoff. Assuming a fully used plan and 92% API gross margins, SemiAnalysis calculates roughly negative 369% gross margin for a subscriber maxing out Opus 5.5, versus about 1% for one maxing out Fable 5.1. At an assumed 20% average utilization, its estimates rise to about 6% and 80%, respectively. These are scenario calculations, not reported company results. They suggest that the cost of generous plans depends heavily on which models subscribers use and how much of their allowance they consume.
For subscribers, the practical consequence is that a stable monthly fee does not guarantee stable usage value. A lower API price can make a plan’s allowance worth less at list prices if the provider does not increase the number of tokens included. SemiAnalysis says OpenAI has no five-hour usage window on its Pro plans, which may help users who need to spend a larger share of their monthly allowance quickly. It judges that feature insufficient to erase the modeled value gap, though its effect will depend on a user’s workload.
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How Model Prices Change Plan Value
SemiAnalysis says both companies have changed model prices and allowances, complicating comparisons over time. Anthropic cut Fable 5.1 cache-read prices by 75% against Fable 5, and cut Opus 5.5 input and output prices by 20% and cache reads by 60% against Opus 5. The report says Fable 5.1 launched without an increase in token limits; Opus allowances rose about 20% on Max and 50% on Pro, still short of fully offsetting the price reductions.
OpenAI’s GPT-6.1 Sol launch also came without a reported limit increase. SemiAnalysis estimates that the change reduced API-equivalent value on the $200 plan by about 30%, in part because Sol’s cached-input price fell. It says the recent reduction flattened the per-dollar value across OpenAI Pro 100, 200 and 500 tiers. The report’s central point is that subscription allowances and API prices must be tracked together: a model becoming cheaper to run does not automatically mean subscribers receive more tokens.
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Actual Subscriber Use Remains Unknown
The estimates assume subscribers use their full limits when calculating maximum API-equivalent value. SemiAnalysis also models a 20% utilization scenario, but the supplied report material does not establish how actual users divide usage among models or how often they reach their caps. Those behaviors determine the real cost to providers and the value individual customers receive.
The report does not provide independent company disclosures backing its revenue and compute estimates. Its comparisons also depend on current plan limits and API list prices, which can change. The practical effect of the five-hour windows, OpenAI’s Ultrafast mode and other plan restrictions may vary by workload; SemiAnalysis says it is still testing Ultrafast. The supplied material does not state how long the current limits will remain in place beyond the transition date for existing $200 subscribers.
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Plan Limits Will Shape the Next Comparison
The next clear date in the report is 29 October, when the old limits for existing $200 ChatGPT Pro subscribers are due to end. New purchasers already receive the reduced allowance, according to SemiAnalysis. The report also says it is continuing to test OpenAI’s 300-token-per-second Ultrafast mode; its measured performance and practical availability could affect how users assess the $500 plan.
Further changes to API prices, model allowances or subscription terms could alter the comparison. Readers evaluating plans should check the providers’ current terms alongside any usage estimate, since the report’s API-equivalent figures reflect the prices and limits it measured.
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Key Questions
What does the reported 5.4 to 5.6 times value mean?
It is SemiAnalysis’s estimate comparing full plan allowances priced at first-party API rates for the mid-tier models in its test. It does not mean subscribers receive cash worth that amount, and it assumes they use the full allowance.
Which plans did SemiAnalysis compare?
For the mid-tier comparison, it paired ChatGPT Plus with Claude Pro, ChatGPT Pro 100 with Claude Max 5x, and ChatGPT Pro 200 with Claude Max 20x. It also compared frontier-model allowances for GPT-6 Astra and Claude Fable 5.1.
What changed for ChatGPT Pro subscribers?
SemiAnalysis says OpenAI roughly halved the usage limits on its $200 plan and introduced a $500 tier. Existing $200 subscribers keep their previous limits until 29 October, while new purchases get the lower limits immediately.
Does a lower API price increase subscription value?
Not necessarily. If a provider lowers the API price but leaves the plan’s token allowance unchanged, the allowance’s API-equivalent dollar value falls. SemiAnalysis says Anthropic and OpenAI both made price changes that were not fully matched by higher limits.
Source: ThorstenMeyerAI.com
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