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OpenAIGPT-6 familyCurrentReasoning modelReleased 22 Sep 2026

GPT-6 Sol

Default choice for coding agents and complex workflows at moderate cost.

Model idgpt-6-sol

Price$2 in, $10 out per 1M tokens

Checked8 October 2026

Knows up to April 2026

1,863events after its cutoff

83 historic, 426 major. 197 days of news.

It launched on 22 September 2026, already missing 440 of them.

Five things it has never heard of

How to call it

4 ways to use GPT-6 Sol, with the model id each provider expects.

Providers, model ids, endpoints and docs for GPT-6 Sol
ProviderModel idEndpointDocs
OpenAI API gpt-6-sol https://api.openai.com/v1/responses developers.openai.com
Azure OpenAI (Microsoft Foundry) gpt-6-sol learn.microsoft.com
OpenRouter openai/gpt-6-sol openrouter.ai
Web app chatgpt.com

Pricing

Prices for GPT-6 Sol
Input$2 per 1M tokens
Cached input$0.20 per 1M tokens
Output$10 per 1M tokens
Cache write$2.50 per 1M tokens

As published: “per 1M tokens (USD), standard tier”.

Source: developers.openai.com, checked 8 October 2026.

Specs

Input
Text and images
Output
Text
Context window
1,050,000 tokens
Max output
128,000 tokens
Open weights
No
Licence
Proprietary
Training cutoff
April 2026
Released
22 September 2026
Status
Current
Type
Reasoning model

What stands out

What its maker marketed at launch, and what people found later, each with its source.

  • Astra-level reliability at lower cost

    OpenAI claims about half as many mistakes as GPT-5.6 Sol at half its API price.

    Source: techcrunch.com

  • Full hosted tool suite

    Web/file search, image generation, code interpreter, hosted shell, apply patch, skills, computer use, MCP and tool search.

    Source: developers.openai.com

  • Image-input bug fix

    Found after launch

    Sep 25 2026 fix for an image-encoding bug that degraded image understanding at launch.

    Source: developers.openai.com

  • Intelligent UI in ChatGPT (October 2026 update)

    Found after launch

    On Oct 7 2026 an October update of this model replaced GPT-5.6 in the ChatGPT Chat tab for Plus, Pro, Business and Enterprise users; it composes answers with native streamable UI components (charts, maps, forms, buttons, calculators, small games) and can start answering while still thinking. The API and Codex/Work keep the September version; the chat-latest snapshot tracks the ChatGPT model.

    Source: openai.com

Four assistants, one scale

GPT-6 Sol is added as a fifth row. Each row runs from what the model knows (graphite) through the months between its cutoff and its launch (hatched) to today (pink).

  1. GPT-6 Astra 271 at launch, 1,863 today
  2. Claude Opus 5.5 372 at launch, 1,795 today
  3. Gemini 4 Hydrogen 1,863 at launch, 1,889 today
  4. Grok 4.7 387 at launch, 1,829 today
  5. GPT-6 Sol 440 at launch, 1,863 today
Show as a table
ModelCutoffReleasedMissing at launchMissing today
GPT-6 AstraApril 20263 September 20262711,863
Claude Opus 5.5June 202622 September 20263721,795
Gemini 4 HydrogenMarch 202612 November 20261,8631,889
Grok 4.7May 202621 September 20263871,829
GPT-6 SolApril 202622 September 20264401,863

Notes

Superseded on Sept 29 2026 by GPT-6.1 Sol (same $2/$10 price, cached input $0.10; see gpt-6-1-sol) but still listed on the pricing page. Mid-tier GPT-6 model for complex coding and agentic workflows; successor to GPT-5.6 Sol. Reasoning effort none..max. OpenRouter also lists openai/gpt-6-sol-pro (reasoning.mode pro). ARC Prize verified (Sept 28 2026) - ARC-AGI-3 4.6% standard harness / 23.0% provider harness, ARC-AGI-2 89.6% at $0.44/task (x.com/arcprize/status/2104671274299429283).

curl https://api.openai.com/v1/responses \
 -H "Authorization: Bearer $OPENAI_API_KEY" -H "Content-Type: application/json" \
 -d '{"model":"gpt-6-sol","input":"Hello"}'

Sources: