One agent session
1M input tokens and 100K output tokens, no caching.
- Input1M x $2 = $2.00
- Output0.1M x $10 = $1.00
$3.00per session
OpenAI - Closed weights
GPT-6.1 Sol pricing and specs
GPT-6.1 Sol is a closed-weights model from OpenAI that costs $2 per 1M input tokens and $10 per 1M output tokens on the first-party API, with a 1.05M-token context window.
Last verified from developers.openai.com. All sources
- Input / 1M
- $2
- Output / 1M
- $10
- Context
- 1.05M tokens
- Weights
- Closed
Pricing per 1M tokens
| Item | Price / 1M tokens |
|---|---|
| InputPrompts up to 272,000 tokens | $2 |
| OutputPrompts up to 272,000 tokens | $10 |
| Cache readPrompts up to 272,000 tokens | $0.10 |
| Cache write (5 minutes)Prompts up to 272,000 tokens | $2.50 |
| Batch inputBatch requests, prompts up to 272,000 tokens | $1 |
| Batch outputBatch requests, prompts up to 272,000 tokens | $5 |
| Long-context inputPrompts over 272,000 tokens | $4 |
| Long-context outputPrompts over 272,000 tokens | $15 |
| Long-context cache readPrompts over 272,000 tokens | $0.20 |
| Long-context cache write (5 minutes)Prompts over 272,000 tokens | $5 |
| Long-context batch inputBatch requests, prompts over 272,000 tokens | $2 |
| Long-context batch outputBatch requests, prompts over 272,000 tokens | $7.50 |
| Fast mode inputFast mode requests | $4 |
| Fast mode outputFast mode requests | $20 |
Note: Priced by prompt length: a request with more than 272K input tokens pays the long-context pricing rates for the whole request (short context is <=272K input tokens). Cached input is 5% of uncached input. OpenAI's cache write (1.25x uncached input) is recorded in cache write; OpenAI does not sell a separate 1-hour write. Batch and Flex are both 50% of Standard. Fast mode is 2x Standard. Ultrafast mode (Responses API, service_tier "ultrafast") is 6x Standard: $12 input / $0.60 cached / $15 cache write / $60 output short context, $24 / $1.20 / $30 / $90 long context. Chat Completions supported without tool calling. Maximum input tokens 922,000. Regional processing adds 10%.
Specs
- Context window
- 1,050,000 tokens
- Max output
- 128,000 tokens
- Release date
- Provider
- OpenAI
- API model id
gpt-6.1-sol- Vercel AI Gateway id
openai/gpt-6.1-sol- Weights
- Closed weights
What GPT-6.1 Sol costs in practice
Worked from the standard list rates above, with the math shown so you can swap in your own token counts. These use the base rates, which apply while each request's prompt stays at or under 272,000 tokens; above that, GPT-6.1 Sol bills $4 input and $15 output for the whole request.
A chat app
10,000 requests a day at 2K input and 500 output tokens each.
- Input20M x $2 = $40.00
- Output5M x $10 = $50.00
$90.00per day
$2,700.00 per 30-day month
The same session at a 90% cache hit
90% of the input is read from the prompt cache. The one-time cache write premium is not included.
- Cached input0.9M x $0.10 = $0.09
- Uncached input0.1M x $2 = $0.20
- Output0.1M x $10 = $1.00
$1.29per session
Compare with
| Model | Input / 1M | Output / 1M |
|---|---|---|
| GPT-6.1 Sol (this page) | $2 | $10 |
| Claude Sonnet 5Anthropic | $2 | $10 |
| Claude Sonnet 5.5Anthropic | $2 | $10 |
| Command ACohere | $2.50 | $10 |
| Command R+ 08-2024Cohere | $2.50 | $10 |
| GPT-4oOpenAI | $2.50 | $10 |
| GPT-5OpenAI | $1.25 | $10 |
| GPT-5.1OpenAI | $1.25 | $10 |
| GPT-6 SolOpenAI | $2 | $10 |
| GPT-4.1OpenAI | $2 | $8 |
| GPT-5.6 TerraOpenAI | $2 | $12 |
Compare
Side-by-side pages with both models' prices, specs, cost examples and like-for-like benchmark rows.
- GPT-6.1 Sol vs Gemini 4 ArgonSimilar price, same tier
- GPT-6.1 Sol vs Claude Sonnet 5.5Similar price, same tier
- GPT-6.1 Sol vs Claude Opus 5.5Similar price, same tier
- GPT-6.1 Sol vs GPT-6 SolSame provider, successor
- GPT-6.1 Sol vs Grok 4.7Similar price, same tier
- GPT-6.1 Sol vs GLM-5.3Open weights vs closed
- GPT-6.1 Sol vs Qwen3.8-2.4T-A95BSimilar price, same tier
- GPT-6.1 Sol vs Qwen3.8-MaxSimilar price, same tier
- GPT-6.1 Sol vs DeepSeek V4 ProOpen weights vs closed
- GPT-6.1 Sol vs Kimi K3Similar price, same tier
Related reading
- GPT-6.1 Sol Release Guide: Near-Astra Agentic Work at $2/$10 and $0.10 Cache ReadsGPT-6.1 Sol release guide: near-Astra scores at a fifth of Astra's price, $0.10 cache reads, verified pricing, the Astra 6.1 safety hold, and how to run it.
- Codex CLI 0.163: Instant Steering Is Now the DefaultCodex CLI 0.163.0 makes mid-response steering the default and adds searchable /config and a leader key. What changed and what to check before upgrading.
- Tool Calling Under the Hood: Claude Messages vs OpenAI ResponsesHow tool calling works on the wire: JSON schema tools, parallel calls, tool_choice, strict mode and streaming deltas in Claude Messages vs OpenAI Responses.
- Codex 'gpt-5.5 Model Is Not Supported' Error: The FixCodex says gpt-5.5 is not supported with a ChatGPT account because OpenAI retired it from ChatGPT sign-in on October 14. The fix and what still works.
- Codex CLI Background Daemon: How to Turn It OffCodex CLI starts a persistent, self-updating background daemon since 0.157.0. What it does, why it hit Hacker News and the reported workaround to turn it off.
- Codex CLI 0.162: Managed Worktrees and Pinned TasksCodex CLI 0.162 lets the agent create and list its own Git worktrees, adds pinned tasks and custom provider capability overrides. What to change this week.
FAQ
How much does GPT-6.1 Sol cost per million tokens?
GPT-6.1 Sol costs $2 per 1M input tokens and $10 per 1M output tokens on OpenAI's first-party API, per developers.openai.com on October 17, 2026. Per 1M tokens, cache reads cost $0.10, and the batch rate is $1 input and $5 output. Prompts over 272,000 tokens are billed at $4 input and $15 output for the whole request.
What is GPT-6.1 Sol's context window?
GPT-6.1 Sol has a 1,050,000-token context window and returns up to 128,000 output tokens per response.
Are GPT-6.1 Sol's weights open?
No. GPT-6.1 Sol is a closed-weights model. You call it through OpenAI's API as gpt-6.1-sol or through Vercel AI Gateway as openai/gpt-6.1-sol.
When was GPT-6.1 Sol released?
OpenAI released GPT-6.1 Sol on September 29, 2026.
Sources
Last verified from developers.openai.com.
Newsletter
Get model price changes as they ship
One email per week. New model releases, price cuts and what they mean for your bill.