GPT-6.1 Sol vs GPT-6 Sol
GPT-6.1 Sol costs the same as GPT-6 Sol, $2 input and $10 output per 1M tokens, but its cached input is half the price: $0.10 against $0.20. Both read up to 1.05M tokens. They were first listed on the API a week apart, GPT-6 Sol on 22 September 2026 and GPT-6.1 Sol on 29 September.
What changed in GPT-6.1 Sol
By the numbers we track, only the cache price. Context (1.05M tokens), output (128K tokens), inputs (text and images) and the input and output prices are the same on both.
Both dates are first API listings, not OpenAI announcement days, so read the week between them as approximate.
What the cheaper cache saves
Uncached, our sessions cost the same on both: $0.65 for a quick fix, $10.80 for the feature session and $97.50 for a long agent day. With 90% of prompts read from the cache, GPT-6.1 Sol costs $2.59 against $3.02 for the feature session and $20.55 against $24.60 for the long day.
Scores
The only score we can cite between them is GPT-6 Sol's 49.3% on FrontierCode 1.1, as Anthropic quoted it. We found none for GPT-6.1 Sol, so the benchmarks can't tell you whether the newer model is better. Sonnet 5.5 against GPT-6.1 Sol sets the newer Sol against Anthropic's model at the same price.
Side by side
| GPT-6.1 Sol | GPT-6 Sol | |
|---|---|---|
| Maker | OpenAI | OpenAI |
| Released | 29 September 2026[1] first API listing | 22 September 2026[2] first API listing |
| Context window | 1.05M tokens[3] | 1.05M tokens[4] |
| Max output | 128K tokens[3] | 128K tokens[4] |
| Input price | $2 per 1M tokens[3] | $2 per 1M tokens[4] |
| Output price | $10 per 1M tokens[3] | $10 per 1M tokens[4] |
| Cached input | $0.10 per 1M tokens[3] | $0.20 per 1M tokens[4] |
| Long prompts | One price | One price |
| Price change | None announced | None announced |
| Open weights | No[5] Listed as an API model, not in OpenAI's open-weight section. | No[5] Listed as an API model, not in OpenAI's open-weight section. |
| Reads | text, image[3] | text, image[4] |
Benchmarks
None of the benchmarks below has a published score for both models. We only show a score we can cite with its source and date; "Not published" means we found none for that model, not that it scored zero.
| Benchmark | GPT-6.1 Sol | GPT-6 Sol |
|---|---|---|
| Terminal-Bench 4.0Agentic coding tasks in a real terminal. | Not published | Not published |
| FrontierCode 1.1 (Main)Hard software engineering tasks. | Not published | 49.3%[6] Quoted by Anthropic. |
| Humanity's Last Exam (with tools)Expert-level questions across many fields, tools allowed. | Not published | Not published |
What a coding session costs
Our own estimate from the list prices above, for three sessions we define: a coding agent resends the conversation with every call, so prompts are large and grow. "Cached" assumes 90% of prompt tokens are read from the prompt cache and leaves out cache write fees. A long-prompt price applies when a call's prompt is over its threshold. Work out your own mix with the token cost calculator.
| Session | GPT-6.1 Sol | GPT-6.1 Sol cached | GPT-6 Sol | GPT-6 Sol cached |
|---|---|---|---|---|
| Quick fix10 calls of 25K prompt and 1.5K output tokens | $0.65 | $0.22 | $0.65 | $0.24 |
| Feature session60 calls of 80K prompt and 2K output tokens | $10.80 | $2.59 | $10.80 | $3.02 |
| Long agent day300 calls of 150K prompt and 2.5K output tokens | $97.50 | $20.55 | $97.50 | $24.60 |
Value for money and release gap
GPT-6.1 Sol is dated 7 days later (GPT-6.1 Sol: first API listing; GPT-6 Sol: first API listing). Price per point divides our feature-session cost by a published score: lower means more score for the money. It is a rough lens, not a ranking.
| Measure | GPT-6.1 Sol | GPT-6 Sol |
|---|---|---|
| Input tokens per $1 | 500K | 500K |
| Filling the whole context window once | $2.10 | $2.10 |
Questions
Is GPT-6.1 Sol more expensive than GPT-6 Sol?
No. Both cost $2 per 1M input tokens and $10 per 1M output tokens. Cached input is $0.10 on GPT-6.1 Sol and $0.20 on GPT-6 Sol.
Is GPT-6.1 Sol better than GPT-6 Sol?
We can't tell from benchmarks yet. The only score we can cite is the 49.3% GPT-6 Sol scored on FrontierCode 1.1, and we found none for GPT-6.1 Sol.
How far apart were GPT-6 Sol and GPT-6.1 Sol released?
A week, by their first API listings: 22 September 2026 for GPT-6 Sol and 29 September 2026 for GPT-6.1 Sol.
Most compared
Any other two models: pick them in the lists at the top of the page.
- Claude Opus 5.5 vs GPT-6.1 Sol
- Claude Sonnet 5.5 vs GPT-6.1 Sol
- GPT-6.1 Sol vs GPT-6 Astra
- Gemini 4 Argon vs GPT-6.1 Sol
- Claude Opus 5.5 vs Claude Sonnet 5.5
- Claude Fable 5.1 vs Claude Opus 5.5
- Claude Opus 5 vs Claude Opus 5.5
- Claude Sonnet 5 vs Claude Sonnet 5.5
- Claude Haiku 5.5 vs Claude Sonnet 5.5
- Claude Haiku 4.5 vs Claude Haiku 5.5
- Claude Fable 5 vs Claude Fable 5.1
- Claude Opus 5.5 vs GPT-5.6 Sol
- Claude Fable 5.1 vs GPT-6 Astra
- Claude Opus 5.5 vs GPT-6 Astra
- Claude Haiku 5.5 vs GPT-6 Luna
- Claude Opus 5.5 vs Gemini 4 Argon
- Claude Sonnet 5.5 vs Gemini 4 Argon
- Claude Opus 5.5 vs Gemini 3.1 Pro Preview
- Gemini 3.1 Pro Preview vs Gemini 4 Argon
- Claude Haiku 5.5 vs Gemini 3.8 Flash
- Claude Opus 5.5 vs Grok 4.7
- Claude Opus 5.5 vs DeepSeek V4 Pro
- Claude Sonnet 5.5 vs Kimi K3
- Claude Sonnet 5.5 vs GLM-5.3
More tools
Sources
Numbers from the makers' own pages, checked by hand, last read . List prices in US dollars before tax. Spotted a mistake? office@shuriken.sh.
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