benchrOpenAI
GPT-5.5
OpenAI · frontier. Frontier math and reasoning.
The published record
Every number below was read from the provider's own documentation on the date shown. benchr does not restate a figure it has not seen published.
- API identifier
gpt-5.5- Context window
- 1050KtokensSource
- Maximum output
- 128KtokensSource
- Input
- $5.00per 1M tokensSource
- Output
- $30.00per 1M tokensSource
- Cached input
- $0.5per 1M tokensSource
- Released
- April 23, 2026Source
- License
- Proprietary
Record verified July 30, 2026
What the record says
Flagship GPT-5.5 (and GPT-5.5 Pro) announced Apr 23, 2026 (do not confuse with GPT-5.5 Instant, the ChatGPT default released May 5, 2026). Context is 1,050,000 (not a round 1M). HealthBench figures are the only official system-card benchmarks. Rechecked 2026-07-30 against developers.openai.com/api/docs/models/gpt-5.5 and /api/docs/pricing: standard $5/$30 with $0.50 cached input; short-context batch $2.50/$15; long-context $10 input, $1 cached input, $45 output above 272K; eligible regional processing carries a 10% uplift. GPT-5.5 Pro is $30/$180 standard and $15/$90 batch with no cached-input discount. The coding/agent numbers circulating (Terminal-Bench 82.7%, OSWorld 78.7%, SWE-bench Pro 58.6%) remain null because the checked model page does not publish directly comparable figures.
What benchr has documented it doing
Capabilities in the benchr ledger that name this model. Documented means a provider says it works and benchr recorded where. Verified means benchr ran it.
1 capabilities name this model. All 1 are officially supported by the provider; benchr has run 0 of them itself.
What has moved
Entries in the change ledger that affect this model, newest first.
Released
GPT-5.5 launched April 24, 2026. $5/$30 standard; $2.50/$15 batch. Source: openai.com/pricing
Which one to use
The rest of the family, with the two numbers that usually decide it. The current model is marked.
| Models | Input | Output | Context window |
|---|---|---|---|
| GPT-5 Mini | $0.25 | $2.00 | 400K |
| GPT-5 | $1.25 | $10.00 | 400K |
| GPT-5.4 | $2.50 | $15.00 | 1050K |
| GPT-5.6 | $4.00 | $20.00 | 1050K |
| GPT-5.5 This page | $5.00 | $30.00 | 1050K |
benchr's read
Worth it for
- Frontier math and reasoning
- Computer use
- Multi-step agents
- Vision + reasoning tasks
Look elsewhere if
- Cost-sensitive workloads — use GPT-5
- Quick chat — the price is hard to justify
Prices, limits, and identifiers above are provider facts. This section is benchr's judgement about them.
What benchr has written about it
Pieces that name this model, newest first. The ones written about this model come before the ones that mention it in passing.
What is not on this page
Stated rather than filled in.
- No first-token or tokens-per-second figure is recorded. benchr has not measured it and the provider does not publish one.
- benchr has not run any capability on this model itself. Everything in the capability section is documentation, not a test result.