GPT-5.5 Pro
- Next shutdown
- None setNo date on 1 platform
- FrontierMath Tier 4
- 78.0%#9 of 58 · Epoch AI
- FrontierMath Tiers 1-3
- 87.7%#8 of 71 · Epoch AI
- List price · $ per 1M
- $30.00 in $180.00 outOpenAI API
- Context window
- 1.1MMax output 128K tokens
Dates on every platform
1 listings · a floor is the earliest possible date
| Platform | Model ID and status | Deprecated | Shuts down | Replacement |
|---|---|---|---|---|
| OpenAI APIOpenAI: List models (GET /v1/models) (opens in a new tab) · checked Oct 14, 2026 | gpt-5.5-proActive · also gpt-5.5-pro-2026-04-23 | – | None set | – |
Not available in Chat Completions.
What breaks when you move off GPT-5.5 Pro
No breaking changes are recorded for GPT-5.5 Pro.
Intelligence
Third-party results, credited below
| Benchmark | Publisher | Score | Rank | Published |
|---|---|---|---|---|
| FrontierMath Tier 4 | Epoch AI | 78.0% ± 6.5% | #9 of 58 | Jun 12, 2026 |
| FrontierMath Tiers 1-3 | Epoch AI | 87.7% ± 1.9% | #8 of 71 | Jun 12, 2026 |
Epoch AI, ‘Capabilities & benchmarking’. Published online at epoch.ai. Retrieved from ‘https://epoch.ai/benchmarks’ [online resource].
List prices
$ per 1M tokens, with each price’s source
| Platform | Input | Cached | Output | In effect | Source |
|---|---|---|---|---|---|
OpenAI APIgpt-5.5-pro | $30.00 | – | $180.00 | Oct 14, 2026Current · Requests over 272K input tokens are billed at higher long-context rates. | OpenAI: Pricing (opens in a new tab) |