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GPT-5.6
PreviewOpenAIFrontierProprietary
OpenAI's mid-2026 flagship, headlined by an industry-leading 1.5M-token context window and long-horizon agentic tool use.
Specifications
- License
- Proprietary
- Weights
- Not released
- Architecture
- Mixture-of-Experts
- Parameters
- Undisclosed
- Context window
- 1.5M tokens
- Max output
- 128K tokens
- Knowledge cutoff
- Jan 31, 2026
- Price (in / out, $/M)
- —
- Modalities
- TextVisionAudioCode
Benchmarks
SWE-bench Verifiedself-reported
76.4%GPQA Diamondself-reported
88.1%Vendor-reported figures are claims until independently verified. See methodology.