GPT-6.1 Sol
Successor to GPT-6 Sol, released one week later at DevDay 2026. reasoning.effort low/medium(default)/high/xhigh/max (no none/minimal). Max input 922K tokens. Chat Completions supported without tool calling. US/EU data residency (Fast mode unavailable with EU residency). In ChatGPT Work and Codex for Plus and above; not yet in Chat as of launch. Ultrafast version promised 'in the coming days'. OpenRouter also lists openai/gpt-6.1-sol-pro.
- Context window
- 1,050,000 tokens
- Max output
- 128,000 tokens
- Knowledge cutoff
- 2026-04
- Input
- text, image
- Output
- text
- License
- proprietary
- Pricing
- input: $2 · cached input: $0.1 · output: $10 · cache write: $2.5 · unit note: prompts >272K input tokens billed at 2x input/cache and 1.5x output; Fast mode 2x; Batch/Flex 50% off; Ultrafast not yet priced (per 1M tokens (USD), standard tier) source
- Verified
- 2026-09-29
How to call it
| Provider | Model id | Endpoint / URL | Docs |
|---|---|---|---|
| OpenAI API | gpt-6.1-sol | https://api.openai.com/v1/responses | docs |
| OpenRouter | openai/gpt-6.1-sol | openrouter.ai/openai/gpt-6.1-sol | — |
| GitHub Copilot | — | github.blog/changelog/2026-09-29-gpt-6-1-sol-in-github-copilot | — |
| Web app | — | chatgpt.com | — |
Notable capabilities (4)
- Near-Astra quality at one-fifth the price: OpenAI says it nearly matches GPT-6 Astra on agentic coding (DeepSWE v1.1), computer use (OSWorld 2.0, within 2.1 pts at ~1/7 cost/task) and professional work at $2/$10 vs Astra's $10/$50. source
- 95% cached-input discount: Cached input costs $0.10 per 1M tokens (5% of the input rate), half of GPT-6 Sol's cached price. source
- Improved alignment vs GPT-6 Sol: Failed to disclose a broken search tool in 2.1% of adversarial tests (GPT-6 Sol 4.9%, Astra 1.5%); no observed attempts to bypass the automated safety reviewer. source
- Full hosted tool suite: Responses API tools: web/file search, image generation, code interpreter, hosted shell, apply patch, skills, computer use, MCP, tool search. source
OpenAI's default mid-tier model for coding agents, computer use and document work as of Sept 29, 2026.
curl https://api.openai.com/v1/responses \
-H "Authorization: Bearer $OPENAI_API_KEY" -H "Content-Type: application/json" \
-d '{"model":"gpt-6.1-sol","reasoning":{"effort":"medium"},"input":"Hello"}'
Rate limits (standard): Tier 1 500 RPM / 500K TPM … Tier 5 15,000 RPM / 40M TPM.
Sources:
Timeline entry
- OpenAI releases GPT-6.1 Sol: near-Astra performance at one-fifth of Astra's price ★★★★
On Sept 29, 2026, at DevDay and one week after GPT-6 Sol, OpenAI released GPT-6.1 Sol (API id gpt-6.1-sol). OpenAI says it "nearly matches" GPT-6 Astra on agentic coding, computer use and professional work at one-fifth of Astra's standard token prices: $2 input, $0.10 cached input and $10 output…
Other OpenAI models
GPT-6 Luna · GPT-6 Sol · GPT Image 2.5 Flare · GPT Image 2.5 Sunburst · GPT-6 Astra · GPT-Live-Transcribe · GPT-Transcribe · GPT-5.6 Terra · GPT-Live 1 · GPT-Realtime-2.1 · GPT-Realtime-2 · GPT-Realtime-Translate · GPT-Rosalind · GPT-Audio-1.5 (and gpt-audio / gpt-audio-mini) · GPT-5.3-Codex · gpt-oss-120b · gpt-oss-20b · GPT-4o mini TTS · text-embedding-3-large · text-embedding-3-small · GPT-5.6 Luna · GPT-5.6 Sol · GPT-Realtime-Whisper · GPT-5.5 Pro · GPT-5.5 · GPT Image 2 · GPT-5.4 · GPT-Realtime-1.5 · GPT-4.1 · GPT-4o · TTS-1 / TTS-1 HD · Whisper large-v3 / large-v3-turbo (open weights) · GPT-Realtime and GPT-Realtime mini · o3 · GPT-4o Transcribe / Mini Transcribe / Transcribe Diarize · Whisper (whisper-1 API) · Sora 2