GPT-5.6 Sol

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OpenAI's GPT-5.6 Sol is the flagship GPT-5.6 model for complex reasoning, coding, and professional work, with text and image input, large-context operation, and Responses API tool support.

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Provider

OpenAI

Model family

OpenAI GPT

Multimodal LLM

Cost tier

Sol

Status

Current

Why teams choose it

🧠

Use as the OpenAI default for the hardest coding

agentic, and professional workflows before falling back to cheaper GPT-5.6 tiers.

📎

Start migration tests from GPT-5.5 or GPT-5.4 with the same reasoning setting

then try one level lower because GPT-5.6 is designed to be more token-efficient.

Tradeoffs to know

Higher unit price than Terra or Luna; route simpler traffic to lower-cost tiers.
Validate exact rate limits, regional processing, and tool availability in current OpenAI docs before production rollout.

When not to use this

Not ideal for simple tasks where cheaper models in the same lineup are good enough.
Avoid for latency-sensitive real-time chat when raw response speed outweighs reasoning depth.
Confirm limits, pricing, and regional availability on the provider side before committing production workloads.

Technical specs

Inputs: text, image
Outputs: text
Capabilities: reasoning, coding, vision, function calling, structured outputs, tool use
License: Proprietary API
Model string: gpt-5-6-sol

Benchmarks

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