GPT-5.1-Codex vs GPT-6.1 Sol Pro
Price, context window & benchmark comparison
VS
Compare different models
Verdict: GPT-5.1-Codex is 14% cheaper than GPT-6.1 Sol Pro on a typical 3:1 input/output mix. GPT-6.1 Sol Pro has the larger context window (1.1M vs 400K).
| GPT-5.1-Codex | GPT-6.1 Sol Pro | |
|---|---|---|
| Input price / 1M | $1.25 | $2.00 |
| Output price / 1M | $10.00 | $10.00 |
| Blended price (3:1) | $3.44 | $4.00 |
| Cached input / 1M | $0.13 | $0.10 |
| Context window | 400K | 1.1M |
| Max output | 128K | 128K |
| Intelligence index | — | — |
| Coding index | — | — |
| Providers | — | 7 |
| Best provider uptime (30m) | — | 100.0% |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2025-11-13 | 2026-09-29 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, GPT-5.1-Codex or GPT-6.1 Sol Pro?
GPT-5.1-Codex is 14% cheaper than GPT-6.1 Sol Pro on a typical 3:1 input/output mix.
GPT-5.1-Codex vs GPT-6.1 Sol Pro: which has a bigger context window?
GPT-5.1-Codex: 400,000 tokens. GPT-6.1 Sol Pro: 1,050,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GPT-5.1-Codex ≈ $7,500, GPT-6.1 Sol Pro ≈ $9,000.
More comparisons
GPT-5.1-Codex vs Gemini 4 CarbonGPT-5.1-Codex vs Claude Fable 5.2GPT-5.1-Codex vs Gemini Omni 1.2 FlashGPT-5.1-Codex vs Gemini Omni 1.1 FlashGPT-5.1-Codex vs Hy4GPT-5.1-Codex vs GLM 5.3 FlashX LegalGPT-5.1-Codex vs GPT-6.1 TerraGPT-5.1-Codex vs GPT-6.1 Terra ProGPT-5.1-Codex vs Kimi K3.1 ProGPT-5.1-Codex vs MiniMax M3.1 FlashGPT-5.1-Codex vs DeepSeek V4.1 Flash 1017GPT-5.1-Codex vs Nemotron 3.5 Super VLGPT-5.1-Codex vs Gemini 4 ArgonGPT-5.1-Codex vs Claude Haiku 5.5GPT-5.1-Codex vs Nano Banana 2.1GPT-5.1-Codex vs Mistral Large 4GPT-6.1 Sol Pro vs Gemini 4 CarbonGPT-6.1 Sol Pro vs Claude Fable 5.2GPT-6.1 Sol Pro vs Gemini Omni 1.2 FlashGPT-6.1 Sol Pro vs Gemini Omni 1.1 FlashGPT-6.1 Sol Pro vs Hy4GPT-6.1 Sol Pro vs GLM 5.3 FlashX LegalGPT-6.1 Sol Pro vs GPT-6.1 TerraGPT-6.1 Sol Pro vs GPT-6.1 Terra Pro