Model comparison
GPT-5-Codex vs GPT-6.1 Sol
GPT-5-Codex has enough public results to be ranked (#190); GPT-6.1 Sol does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in coding, where GPT-6.1 Sol leads 51.4 to 41.9.
- GPT-5-Codex is cheaper at $1.25 / $10 per million input/output tokens, against $2 / $10 for GPT-6.1 Sol.
- GPT-6.1 Sol accepts more context: 1.05M tokens versus 400K.
Side by side
| GPT-5-Codex | GPT-6.1 Sol | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 37.3 | 42.1 |
| Released | 2025-09-15 | 2026-09-29 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 1.05M |
| Max output | 128K | 128K |
| Input $ / M tokens | $1.25 | $2 |
| Output $ / M tokens | $10 | $10 |
| Results tracked | 3 | 2 |
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Category by category
Coding GPT-6.1 Sol leads
GPT-5-Codex: 41.9 (#100), GPT-6.1 Sol: 51.4
Agentic & Tool Use GPT-6.1 Sol leads
GPT-5-Codex: 30.8 (#66), GPT-6.1 Sol: 34.3
| Benchmark | GPT-5-Codex | GPT-6.1 Sol |
|---|---|---|
| Terminal-Bench | 44.3% | — |
| GDP.pdf | — | 32% |
Reasoning Not comparable
GPT-5-Codex: 30.0 (#80), GPT-6.1 Sol: —
| Benchmark | GPT-5-Codex | GPT-6.1 Sol |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
Frequently asked questions
Is GPT-5-Codex better than GPT-6.1 Sol?
GPT-5-Codex has enough public results to be ranked (#190); GPT-6.1 Sol does not yet, so treat this comparison as directional.
Which is cheaper, GPT-5-Codex or GPT-6.1 Sol?
GPT-5-Codex is cheaper. It lists at $1.25 per million input tokens and $10 per million output tokens; GPT-6.1 Sol lists at $2 and $10.
Is GPT-5-Codex or GPT-6.1 Sol better for coding?
GPT-6.1 Sol scores higher on coding benchmarks: 51.4 versus 41.9 in the Noometry coding category.
Which has the bigger context window?
GPT-6.1 Sol does, with 1.05M tokens against 400K.
How many benchmarks do GPT-5-Codex and GPT-6.1 Sol share?
0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and GPT-6.1 Sol has 2.