GPT-5.6 Sol

GPT-5.6 Sol is a frontier model from OpenAI for complex professional work, coding, and agentic workflows. It is part of the gpt-sol line, released on 2026-07-09, and follows the previous version GPT-5.6 in the same line. It has a context window of 1,050,000 tokens and a maximum output of 128,000 tokens. Pricing starts at $1.50 per million input tokens and $10.00 per million output tokens, with cached input at $0.15 per million tokens. Weights are not open. It supports reasoning mode, tool calling, and accepts image, PDF, and text inputs, returning text. Knowledge cutoff is 2026-02-16.

First version of its line in the registry.

Range across the hosts that serve it: up to $8.00 per 1M input tokens.

• ·1.05M token context window
• ·128K max output tokens
• ·Supports reasoning and tool calling
• ·Accepts image, PDF, and text inputs
• ·Cached input at $0.15 per million tokens

• Reach for it for complex professional work
• Reach for it for coding tasks
• Reach for it for agentic workflows
• Reach for it for processing long documents

33 hosts serve this model at the price above · the maker's documentation

• 8GPT-6 Astra has gained the ability to drive a car2026-09-24
• 8Arena Test: GPT-6 Sol (Max) Ranks 4th in Code Arena: WebDev with a Score of 16892026-09-24
• 7Inside OpenAI's log of misbehaving models2026-09-19
• 81300张卡叫板10万卡！前OpenAI副总裁出手，硬核难题击败GPT-6 Astra2026-09-18
• 5派早报：佳能发布 EOS R8 Mark II、GPT-5.5 即将下线等2026-09-17

5 signals of the archive mention this model, each scored against the published bar. This list is rebuilt from the archive at every build, so it cannot go stale.

The registry keeps the six most recent versions of a line. Older ones stay in the file and can be surfaced without a rebuild.

What is the context window?

1,050,000 tokens.

Is it open weights?

No, weights are not open.

What input types does it accept?

Image, PDF, and text.