Model registry / OpenAI / GPT Sol / GPT-5.6
GPT-5.6
Frontier GPT-5.6 model for complex professional work, coding, and agentic workflows
Line
GPT Sol
Weights
API only
Released
2026-07-09
Context
1.05M
Input
$1.50 / 1M
Output
$12.00 / 1M
Max output
128K
Coverage
10 signals
Overview
GPT-5.6 is a frontier model from OpenAI for complex professional work, coding, and agentic workflows. It is the first version of the gpt-sol line. It has a context window of 1,050,000 tokens and a max output of 128,000 tokens. Price starts at $1.50 per million input tokens and $12.00 per million output tokens, with cached input at $0.15 per million. Weights are not open. It supports reasoning mode, tool calling, and accepts image, pdf, and text inputs, returning text.
Specs
Pricing
First version of its line in the registry.
Range across the hosts that serve it: up to $4.00 per 1M input tokens.
Strengths
- 1,050,000 token context window
- 128,000 token max output
- Supports reasoning mode and tool calling
- Accepts image, pdf, and text inputs
- Cached input at $0.15 per million tokens
Best for
- Reach for it for complex professional work
- Reach for it for coding tasks
- Reach for it for agentic workflows
How to access
2 hosts serve this model at the price above · the maker's documentation
What the digest said
- 8Arena Review: GPT-6 Luna (Max) Ranks 23rd on Agent Arena with a Single Task Cost of Only $0.052026-09-29
- 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
- 9Claude Opus 5.5 and GPT-6 Sol/Luna Released, Simon Willison Details New Price War2026-09-23
- 9OpenAI Releases GPT-6 Sol and GPT-6 Luna, API Prices 50% Lower Than GPT-5.62026-09-23
- 8Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war2026-09-23
- 9那个教 ChatGPT 说话的人，做了一个「哑巴」模型2026-09-19
- 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
10 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.
GPT Sol: every version
The registry keeps the six most recent versions of a line. Older ones stay in the file and can be surfaced without a rebuild.
FAQ
- What is the context window?
- The context window is 1,050,000 tokens.
- Is it open weights?
- No, the weights are not open.
- What input types does it accept?
- It accepts image, pdf, and text inputs.