Model comparison
GPT-5.3 Codex vs GPT-6.1 Sol
GPT-5.3 Codex has enough public results to be ranked (#61); GPT-6.1 Sol does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in agentic & tool use, where GPT-5.3 Codex leads 47.8 to 34.3.
- GPT-6.1 Sol is cheaper at $2 / $10 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- GPT-6.1 Sol accepts more context: 1.05M tokens versus 400K.
Side by side
| GPT-5.3 Codex | GPT-6.1 Sol | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 45.5 | 42.1 |
| Released | 2026-02-05 | 2026-09-29 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 1.05M |
| Max output | 128K | 128K |
| Input $ / M tokens | $1.75 | $2 |
| Output $ / M tokens | $14 | $10 |
| Results tracked | 8 | 2 |
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Category by category
Coding GPT-6.1 Sol leads
GPT-5.3 Codex: 48.5 (#51), GPT-6.1 Sol: 51.4
| Benchmark | GPT-5.3 Codex | GPT-6.1 Sol |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| DeepSWE | — | 75.2% |
| LMArena WebDev | 1408 | — |
| WeirdML | 79.3% | — |
| ALE-Bench | 1,655 | — |
Agentic & Tool Use GPT-5.3 Codex leads
GPT-5.3 Codex: 47.8 (#9), GPT-6.1 Sol: 34.3
| Benchmark | GPT-5.3 Codex | GPT-6.1 Sol |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| GDP.pdf | — | 32% |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |
Reasoning Not comparable
GPT-5.3 Codex: —, GPT-6.1 Sol: —
| Benchmark | GPT-5.3 Codex | GPT-6.1 Sol |
|---|---|---|
| Epoch Capabilities Index | 156.84 | — |
Frequently asked questions
Is GPT-5.3 Codex better than GPT-6.1 Sol?
GPT-5.3 Codex has enough public results to be ranked (#61); GPT-6.1 Sol does not yet, so treat this comparison as directional.
Which is cheaper, GPT-5.3 Codex or GPT-6.1 Sol?
GPT-6.1 Sol is cheaper. It lists at $2 per million input tokens and $10 per million output tokens; GPT-5.3 Codex lists at $1.75 and $14.
Is GPT-5.3 Codex or GPT-6.1 Sol better for coding?
GPT-6.1 Sol scores higher on coding benchmarks: 51.4 versus 48.5 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-5.3 Codex and GPT-6.1 Sol share?
0 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and GPT-6.1 Sol has 2.