🔍 Read the full analysis: AI Subscriptions Under The Microscope: The 5X Is A Subsidy on ThorstenMeyerAI.com
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TL;DR
SemiAnalysis compared AI subscription usage limits with the cost of equivalent API use and estimated that Claude’s mid-tier plans provide roughly 5.4 to 5.6 times the API-equivalent value of comparable ChatGPT plans for a coding-agent workload. The report also says recent price and allowance changes have reduced value on both services, while heavy use of premium models can make subscriptions costly for providers.
SemiAnalysis has published a token-by-token comparison of major AI subscriptions, estimating that Claude’s mid-tier plans deliver about five to six times the API-equivalent usage of comparable ChatGPT plans for a coding-agent workload. The analysis matters because it links advertised usage limits to provider costs, and finds that heavy use of premium models can make subscriptions expensive to serve.
The report compared how each provider’s usage meter changes across token types, then priced the measured allowance using the provider’s API list rates. For the selected coding-agent workload, about 96.6% of tokens were cached input, with roughly 0.4% fresh input, 2.6% cache writes and 0.3% output. SemiAnalysis calls the resulting dollar figure “API value”: the list-price cost of using the plan’s full monthly allowance.
At $20 per month, the report estimates $211 in API value for ChatGPT Plus using GPT-6.1 Sol, compared with $1,178 for Claude Pro using Opus 5.5. At $100, it estimates $1,055 for ChatGPT Pro 100 and $5,725 for Claude Max 5x. At $200, the estimates are $2,084 for ChatGPT Pro 200 and $11,726 for Claude Max 20x. The resulting ratios are approximately 5.4 to 5.6 times. These are estimates for the workload and models tested, not a measure of every subscriber’s experience.
The report says the comparison remains wide even when counted in raw tokens, though Opus 5.5’s higher API price increases its dollar-value estimate relative to the cheaper Sol model. At the frontier tier, the allowances look closer: SemiAnalysis estimates a $200 ChatGPT plan would use about $2,897 of GPT-6 Astra API value, while Claude’s Fable 5.1 would use about $2,485 and consume half of the plan’s limit. The remaining Claude allowance can be used for Opus or Sonnet.
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 comparison is relevant to subscribers weighing plan limits, but SemiAnalysis argues its larger implication is economic. The firm estimates that subscriptions account for about 10% of Anthropic revenue while consuming more than 40% of its inference compute. It estimates that this mix lowers Anthropic’s blended revenue per megawatt by roughly $36 million. These are the report’s estimates; the supplied material does not provide the underlying company disclosures or calculation detail.
Under SemiAnalysis’s model, a fully used Opus 5.5 subscription could imply a gross margin of about minus 369%, assuming 92% gross margins on API sales. The comparable estimate for Fable 5.1 is about 1%. At 20% average utilization, the report estimates margins of roughly 6% for Opus and 80% for Fable. The contrast suggests that the cost to serve depends heavily on which models subscribers use and how much of their allowance they consume.
For readers, that makes “value” a moving target. A plan can appear generous at API list prices while costing the provider more than it earns from frequent use of its most expensive models. Providers can respond by changing limits, model availability or prices, which can alter the practical value of a subscription over time.
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Recent Price and Limit Changes
SemiAnalysis’s comparison reflects recent changes at both providers. The report says OpenAI halved the allowance on its $200 plan, with token limits roughly cut in half across model tiers. For Sol-class models, API-equivalent value fell by more than half because OpenAI also lowered GPT-6.1 Sol’s cached-input API price. Existing subscribers keep their previous limits until October 29; new purchases receive the lower limits immediately, according to the report.
OpenAI also introduced a $500 plan. SemiAnalysis estimates it provides about 21% more Astra usage than the former $200 plan, and less Sol-class API value, while offering an “Ultrafast” mode rated at 300 tokens per second. The report says it is still testing that mode. OpenAI removed “5x more usage” and “20x more usage” comparisons from its pricing page, according to the source material. SemiAnalysis says Pro plans do not have a five-hour usage window, which may help people who use a large share of their allowance in short bursts.
Anthropic has also cut API prices. The report says Fable 5.1 reduced cache-read prices by 75% compared with Fable 5, without increasing token limits. Opus 5.5 cut input and output prices by 20% and cache reads by 60%; SemiAnalysis estimates that Opus allowances increased about 20% on Max and 50% on Pro, still short of fully offsetting the price cuts. It also says OpenAI did not raise limits when GPT-6.1 Sol launched, leaving API-equivalent value on the $200 plan about 30% lower.
AI model usage monitoring software
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How Limits Will Change
The figures are workload-specific estimates, based on one token mix and API list prices. The supplied source material does not show the full test protocol, all subscription terms or how allowances translate into use across every model and task. Actual value will vary with a subscriber’s usage pattern, available models and any provider restrictions.
It is also unclear how long the current limits and prices will remain in place. The report’s margin estimates depend on assumptions about utilization and API gross margins; the materials provided do not include provider-confirmed subscription costs or a breakdown of compute by model. SemiAnalysis suggests OpenAI faced limited backlash to its plan changes, possibly because DevDay announcements followed the next day and existing $200 subscribers were temporarily grandfathered. That explanation is the firm’s interpretation, not a confirmed account of subscribers’ reactions or OpenAI’s motives.
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Provider Limits and Testing
The next concrete date in the report is October 29, when the old limits are due to end for existing $200 ChatGPT Pro subscribers. New buyers already receive the reduced allowances, according to SemiAnalysis. The report also says its assessment of OpenAI’s 300-token-per-second Ultrafast mode is ongoing.
Subscribers and providers will be able to judge the practical effect as the limits take hold and more details emerge about model access, usage windows and performance. Further price cuts or allowance changes could also shift the API-equivalent calculations; any comparison should be read against the plans and rates in effect at the time.
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Key Questions
What does API-equivalent value mean in this report?
It is the estimated API list-price cost of using a plan’s full monthly allowance, based on the tokens and models measured by SemiAnalysis. It is not cash back or a guarantee that every subscriber can use the full allowance.
Which plans did SemiAnalysis compare?
The central comparison covers ChatGPT Plus at $20 against Claude Pro, $100 ChatGPT Pro 100 against Claude Max 5x, and $200 ChatGPT Pro 200 against Claude Max 20x. The report uses GPT-6.1 Sol and Claude Opus 5.5 for those estimates.
Does the report show Claude is always five times better value?
No. The roughly 5.4-to-5.6 ratio applies to a specific coding-agent workload and the models tested. Different token mixes, model choices, limits and usage patterns can produce different results.
What happens to existing $200 ChatGPT Pro subscribers?
SemiAnalysis says existing subscribers retain their previous limits until October 29. New purchases receive the reduced limits immediately, according to the report.
Why might providers change subscription limits?
The report estimates that heavy use of premium models can cost more to serve than subscription revenue covers. Its margin calculations depend on usage and pricing assumptions, and the providers’ own subscription economics are not confirmed in the supplied material.
Source: ThorstenMeyerAI.com
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