Model comparison
GPT-5.3 Codex vs Olmo 7b Instruct
GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 29.7 on the Noometry Index.
Last verified . 0 shared benchmarks.
Allen Institute for AI (Ai2)Summary
- The widest gap is in coding, where GPT-5.3 Codex leads 48.5 to 29.1.
- Olmo 7b Instruct has downloadable open weights; the other is API-only.
Side by side
| GPT-5.3 Codex | Olmo 7b Instruct | |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 45.5 | 29.7 |
| Released | 2026-02-05 | — |
| Weights | Proprietary | Open |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.75 | — |
| Output $ / M tokens | $14 | — |
| Results tracked | 8 | 10 |
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Category by category
Coding GPT-5.3 Codex leads
GPT-5.3 Codex: 48.5 (#51), Olmo 7b Instruct: 29.1 (#298)
| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1408 | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1016 |
| ALE-Bench | 1,655 | — |
Agentic & Tool Use Not comparable
GPT-5.3 Codex: 47.8 (#9), Olmo 7b Instruct: —
| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |
Reasoning Not comparable
GPT-5.3 Codex: —, Olmo 7b Instruct: 18.0 (#273)
| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| LMArena Hard Prompts | — | 993 |
| Epoch Capabilities Index | 156.84 | — |
Math Not comparable
GPT-5.3 Codex: —, Olmo 7b Instruct: 27.8 (#234)
| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| LMArena Math | — | 1018 |
Multilingual Not comparable
GPT-5.3 Codex: —, Olmo 7b Instruct: 24.1 (#286)
| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| LMArena Non-English | — | 977 |
| LMArena Chinese | — | 1013 |
| LMArena Russian | — | 946 |
Instruction Following Not comparable
GPT-5.3 Codex: —, Olmo 7b Instruct: 49.3 (#296)
| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| LMArena Instruction Following | — | 978 |
Writing & Preference Not comparable
GPT-5.3 Codex: —, Olmo 7b Instruct: 26.0 (#298)
| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| LMArena Text | — | 1032 |
| LMArena Creative Writing | — | 990 |
| LMArena Multi-Turn | — | 1007 |
Frequently asked questions
Is GPT-5.3 Codex better than Olmo 7b Instruct?
GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 29.7 on the Noometry Index.
Is GPT-5.3 Codex or Olmo 7b Instruct better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 29.1 in the Noometry coding category.
How many benchmarks do GPT-5.3 Codex and Olmo 7b Instruct share?
0 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Olmo 7b Instruct has 10.