As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/gpt-6-sol/

# GPT-6 Sol

OpenAI, GPT-6 family. Status: current. Type: reasoning model. Released: 2026-09-22. Training cutoff: 2026-04.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| OpenAI API | `gpt-6-sol` | https://api.openai.com/v1/responses | https://developers.openai.com/api/docs/models/gpt-6-sol |
| Azure OpenAI (Microsoft Foundry) | `gpt-6-sol` |  | https://learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/models-sold-directly-by-azure |
| OpenRouter | `openai/gpt-6-sol` |  | https://openrouter.ai/openai/gpt-6-sol |
| Web app |  |  | https://chatgpt.com |

## Pricing

- Input: $2 per 1M tokens
- Cached input: $0.20 per 1M tokens
- Output: $10 per 1M tokens
- Cache write: $2.50 per 1M tokens
- Unit as published: per 1M tokens (USD), standard tier
- Source: https://developers.openai.com/api/docs/pricing
- Last checked: 2026-10-08

## Specs

- Input: text, image
- Output: text
- Context window: 1,050,000 tokens
- Max output: 128,000 tokens
- Open weights: no
- Licence: proprietary

## What it has not seen

- Published training cutoff: 2026-04 (April 2026).
- AI events after it on Post-Cutoff: 1,863 (426 major, 83 historic), as of 2026-11-13.
- Already missing at launch: 440.
- Briefings of the news since April 2026: https://postcutoff.com/briefings/cutoff-2026-04-s.md (short), https://postcutoff.com/briefings/cutoff-2026-04-m.md (medium), https://postcutoff.com/briefings/cutoff-2026-04.md (full).
- Its card, with five things it has never heard of: https://postcutoff.com/you/gpt-6-sol/

## What stands out

- Astra-level reliability at lower cost: OpenAI claims about half as many mistakes as GPT-5.6 Sol at half its API price. Source: https://techcrunch.com/2026/09/22/openai-launches-gpt-6-sol-and-luna/
- Full hosted tool suite: Web/file search, image generation, code interpreter, hosted shell, apply patch, skills, computer use, MCP and tool search. Source: https://developers.openai.com/api/docs/models/gpt-6-sol
- Image-input bug fix (found after launch): Sep 25 2026 fix for an image-encoding bug that degraded image understanding at launch. Source: https://developers.openai.com/api/docs/changelog
- 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: https://openai.com/index/gpt-6-for-everyone/

## 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).

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

```bash
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:
- https://developers.openai.com/api/docs/models/gpt-6-sol
- https://developers.openai.com/api/docs/pricing
- https://developers.openai.com/api/docs/changelog
- https://techcrunch.com/2026/09/22/openai-launches-gpt-6-sol-and-luna/
- Models overview: https://developers.openai.com/api/docs/models

Model page: https://postcutoff.com/m/gpt-6-sol/