🔍 Read the full analysis: SemiAnalysis Takes A Closer Look At 5X AI Subscription Pricing on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis compared usage limits across major AI subscriptions by tracking token consumption and valuing that usage at API list prices. It estimates Claude plans provide about 5.4 to 5.6 times the API-priced value of comparable ChatGPT plans on mid-tier models, while recent price and limit changes have reduced value on both services.
SemiAnalysis has compared usage limits across major AI subscriptions by measuring how plan usage bars move for different token types, then pricing the estimated usage at each provider’s API list rates. For the mid-tier models it examined, the report estimates Claude plans provide roughly 5.4 to 5.6 times the API-priced usage of similarly priced ChatGPT plans, a gap with implications for subscribers and the costs of serving heavy users.
The comparison covers subscriptions from Anthropic and OpenAI, as well as plans from Meta, SpaceXAI, Cursor, Cognition, Z.ai, MiniMax and Moonshot. For an agentic workload resembling coding-agent use, SemiAnalysis compared Claude Opus 5.5 with GPT-6.1 Sol. It says that workload is dominated by cached input: about 96.6% cached input, 2.6% cache writes, 0.4% fresh input and 0.3% output. The report’s API-value estimate prices a plan’s full monthly usage limit at the provider’s first-party API rates.
At $20 per month, SemiAnalysis estimates Claude Pro’s Opus allowance represents about $1,178 in API usage, compared with $211 for ChatGPT Plus using Sol. At $100, its estimates are $5,725 for Claude Max 5x and $1,055 for ChatGPT Pro 100. At $200, they are $11,726 for Claude Max 20x and $2,084 for ChatGPT Pro 200. These figures imply ratios of about 5.4 to 5.6 times. The report says the difference remains substantial when comparing token counts instead of dollar values, because Sol is cheaper per token than Opus.
The picture differs at the frontier tier. SemiAnalysis describes the GPT-6 Astra and Claude Fable 5.1 allowances as broadly similar. On a $200 plan, the report estimates that Astra usage reaches about $2,897 at API prices before the allowance is exhausted. Fable reaches about $2,485 while using half of the Claude plan’s limit; the remaining allowance can be used with Opus or Sonnet.
The analysis also reflects a recent OpenAI change. SemiAnalysis says OpenAI roughly halved token allowances across model tiers on its $200 plan. Existing subscribers keep their old limits until October 29, while new purchases receive the reduced limits. The report says a new $500 tier offers about 21% more Astra than the former $200 plan, but less Sol-class API value. Its stated differentiator is an Ultrafast mode advertised 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.
Subscription Value and Compute Costs
The estimated gap matters because subscription value is tied to both customer pricing and inference costs. SemiAnalysis estimates subscriptions account for about 10% of Anthropic revenue while consuming more than 40% of its inference compute. The report says this mix lowers blended revenue per megawatt by roughly $36 million. It describes subscriptions as a larger share of OpenAI revenue, though the provided analysis does not give a comparable percentage for OpenAI.
SemiAnalysis models how usage affects gross margins. Assuming a subscriber uses the entire allowance and API business gross margins are 92%, it estimates a fully used Opus 5.5 plan would have a gross margin of about negative 369%, while a fully used Fable 5.1 plan would be near 1%. At 20% average utilization, the corresponding estimates rise to about 6% and 80%. These are scenario estimates from the report, not audited results or a measure of every subscriber’s actual costs.
The estimates help explain why headline plan value can change as models and prices change. A generous allowance may attract users, while frequent use of the most expensive models can cost the provider more than the subscription brings in. For subscribers, the practical value also depends on how often they use the service, which model they select and whether usage windows restrict when they can spend their allowance.
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Recent Model and Plan Changes
Both companies have adjusted API prices and subscription limits. According to SemiAnalysis, Fable 5.1 cut cache-read prices by 75% compared with Fable 5, but launched without an increase in its subscription token limit. Opus 5.5 cut input and output prices by 20% and cache-read prices by 60% relative to Opus 5. Anthropic raised reported allowances by about 20% on Max and 50% on Pro, but SemiAnalysis says those increases did not fully offset the price reductions in its API-value calculation.
The report says GPT-6.1 Sol launched without a corresponding limit increase, and that the API-equivalent value of the $200 ChatGPT plan fell by about 30% as Sol’s cached-input price decreased. It also says OpenAI removed the relative-usage multipliers, such as “5x more usage” and “20x more usage,” from its pricing page. Those changes make direct comparisons across older and newer plan descriptions harder.
SemiAnalysis notes one practical difference: OpenAI Pro plans do not have a five-hour usage window. That may help users who need to spend a large share of their allowance in a short period, although the report says it does not offset the estimated mid-tier value gap. The comparison’s results depend on its workload mix and the API prices used for the calculation.
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How Subscribers Use Their Allowances
The API-equivalent figures assume use of the full monthly allowance; they do not show what a typical subscriber consumes. SemiAnalysis presents a separate 20% utilization scenario for margin estimates, but the supplied material does not provide observed usage rates across subscribers or a breakdown by model and plan. The practical value for an individual user may differ from the report’s full-use comparison.
The workload mix also shapes the result. The central comparison is based on an agentic, coding-agent-style workload with a large share of cached input. Users whose work has a different balance of fresh input, cache writes and output may see different API-equivalent values. The source material does not specify enough about the testing procedure to independently reproduce the usage-bar measurements.
Some plan details are still being evaluated. SemiAnalysis says its testing of the new $500 plan’s Ultrafast mode is ongoing. The available material also does not establish how providers may change future allowances, prices or model access.
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Further Testing and Plan Updates
SemiAnalysis says it is still testing the 300-token-per-second Ultrafast mode associated with OpenAI’s $500 plan. Further results could clarify how much the feature changes the plan’s practical value beyond its listed usage limits. OpenAI’s existing $200 subscribers are scheduled to retain their previous allowances until October 29; the source material does not describe what changes for those subscribers after that date.
For readers comparing plans, the next useful information will be provider disclosures or further measurements showing how limits vary by model, workload and time window. Any new API price changes or allowance adjustments could also alter the report’s dollar-value comparisons. The supplied material does not announce a response from either company to SemiAnalysis’s estimates.
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Key Questions
What did SemiAnalysis compare?
It measured how subscription usage limits move across token types, then estimated the API list-price value of the usage. Its comparison includes plans from several AI providers, with detailed figures for OpenAI and Anthropic.
How large is the estimated Claude and ChatGPT gap?
For the mid-tier Opus 5.5 and GPT-6.1 Sol comparison, SemiAnalysis estimates Claude plans provide about 5.4 to 5.6 times the API-priced value of similarly priced ChatGPT plans. The estimate depends on the workload and pricing assumptions described in the report.
Why did OpenAI change its $200 plan?
The source material reports that OpenAI reduced token allowances across model tiers and introduced a $500 plan, but does not give the company’s stated rationale for those changes.
Do the figures show what a typical subscriber saves?
No. They estimate the API list-price value of plan usage, including a full-allowance comparison. They do not establish typical subscriber usage or guaranteed savings.
When do existing $200 ChatGPT Pro limits change?
SemiAnalysis says existing subscribers keep their prior limits until October 29. New purchases receive the reduced limits immediately, according to the report.
Source: ThorstenMeyerAI.com
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