GPT-5.5
AvailableA prior GPT generation for reasoning and tool-driven work.
Access details: OpenAI · Responses API
An alias. The provider can point it at a newer version.
gpt-5.5Updated Oct 20, 2026
Capabilities & limits
- Context window
- 1.05M
- Maximum output
- 128K
- Image input
- Supported
- Tool calling
- Supported
- Structured output
- Supported
Pricing
USD / 1M tokens- Input
- $5.00
- Output
- $30.00
Standard text rates up to 272K input tokens. Longer sessions and regional processing have different rates. Cache, batch, and tools are excluded.
Full rate card 6 rates
All prices in USD.
Short-context input
$5.00 per 1M tokens- prompt ≤ 272K input tokens
Short-context output
$30.00 per 1M tokens- prompt ≤ 272K input tokens
Cached input
$0.50 per 1M tokens- prompt ≤ 272K input tokens
Long-context input
$10.00 per 1M tokens- prompt > 272K input tokens
- rate applies to the full session
Long-context output
$45.00 per 1M tokens- prompt > 272K input tokens
- rate applies to the full session
Long-context cached input
$1.00 per 1M tokens- prompt > 272K input tokens
- rate applies to the full session
Other tiers per 1M tokens (short context): Batch: $2.5 input / $15 output / $0.25 cached; Flex: $2.5 input / $15 output / $0.25 cached; Fast mode: $12.5 input / $75 output / $1.25 cached. Regional processing (data residency) endpoints add a 10% uplift. Prompt caching works only with extended prompt caching.
Price history
Sep 13, 2026
Input $5.00 per million tokens
Sep 23, 2026
Input $5.00 per million tokens
Sep 13, 2026
Output $30.00 per million tokens
Sep 23, 2026
Output $30.00 per million tokens
Technical details
- Parameters
- Not published
- Active parameters
- Not published
- Architecture
- Not published
- Training / knowledge cutoff
- Dec 01, 2025
- Input modalities
- Text, image
- Output modalities
- Text
From OpenAI
Official announcement ↗Release & lifecycle
- First available
- Apr 24, 2026
- available
- As of Sep 13, 2026
- available
- As of Oct 20, 2026