Model comparison
C4ai Aya Expanse 8b vs GPT-5.3 Codex
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 34.9 on the Noometry Index.
Last verified . 0 shared benchmarks.
CohereSummary
- The widest gap is in coding, where GPT-5.3 Codex leads 48.6 to 33.8.
- C4ai Aya Expanse 8b has downloadable open weights; the other is API-only.
Side by side
| C4ai Aya Expanse 8b | GPT-5.3 Codex | |
|---|---|---|
| Provider | Cohere | OpenAI |
| Noometry Index | 34.9 | 45.8 |
| Released | — | 2026-02-05 |
| Weights | Open | Proprietary |
| Context window | — | 400K |
| Max output | — | 128K |
| Input $ / M tokens | — | $1.75 |
| Output $ / M tokens | — | $14 |
| Results tracked | 15 | 8 |
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Category by category
Coding GPT-5.3 Codex leads
C4ai Aya Expanse 8b: 33.8 (#252), GPT-5.3 Codex: 48.6 (#56)
| Benchmark | C4ai Aya Expanse 8b | GPT-5.3 Codex |
|---|---|---|
| SWE-bench Verified | — | 74.8% |
| LMArena WebDev | — | 1409 |
| WeirdML | — | 79.3% |
| LMArena Coding | 1160 | — |
| ALE-Bench | — | 1,655 |
Agentic & Tool Use Not comparable
C4ai Aya Expanse 8b: —, GPT-5.3 Codex: 48.0 (#9)
| Benchmark | C4ai Aya Expanse 8b | GPT-5.3 Codex |
|---|---|---|
| Terminal-Bench | — | 78.4% |
| METR Time Horizons | — | 74.5% |
| Vending-Bench 2 | — | 5,940 |
Reasoning Not comparable
C4ai Aya Expanse 8b: 22.4 (#197), GPT-5.3 Codex: —
| Benchmark | C4ai Aya Expanse 8b | GPT-5.3 Codex |
|---|---|---|
| LMArena Hard Prompts | 1156 | — |
| Epoch Capabilities Index | — | 156.77 |
Math Not comparable
C4ai Aya Expanse 8b: 33.3 (#203), GPT-5.3 Codex: —
| Benchmark | C4ai Aya Expanse 8b | GPT-5.3 Codex |
|---|---|---|
| LMArena Math | 1168 | — |
Knowledge Not comparable
C4ai Aya Expanse 8b: 33.6 (#201), GPT-5.3 Codex: —
| Benchmark | C4ai Aya Expanse 8b | GPT-5.3 Codex |
|---|---|---|
| Vectara Hallucination Rate | 9.5% | — |
| LMArena Expert | 1153 | — |
Multilingual Not comparable
C4ai Aya Expanse 8b: 36.1 (#242), GPT-5.3 Codex: —
| Benchmark | C4ai Aya Expanse 8b | GPT-5.3 Codex |
|---|---|---|
| LMArena Non-English | 1180 | — |
| LMArena Chinese | 1181 | — |
| LMArena German | 1188 | — |
| LMArena Japanese | 1120 | — |
| LMArena Russian | 1197 | — |
Instruction Following Not comparable
C4ai Aya Expanse 8b: 60.1 (#253), GPT-5.3 Codex: —
| Benchmark | C4ai Aya Expanse 8b | GPT-5.3 Codex |
|---|---|---|
| LMArena Instruction Following | 1155 | — |
Long Context Not comparable
C4ai Aya Expanse 8b: 36.1 (#236), GPT-5.3 Codex: —
| Benchmark | C4ai Aya Expanse 8b | GPT-5.3 Codex |
|---|---|---|
| LMArena Longer Query | 1191 | — |
Writing & Preference Not comparable
C4ai Aya Expanse 8b: 39.0 (#250), GPT-5.3 Codex: —
| Benchmark | C4ai Aya Expanse 8b | GPT-5.3 Codex |
|---|---|---|
| LMArena Text | 1185 | — |
| LMArena Creative Writing | 1168 | — |
| LMArena Multi-Turn | 1160 | — |
Frequently asked questions
Is C4ai Aya Expanse 8b better than GPT-5.3 Codex?
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 34.9 on the Noometry Index.
Is C4ai Aya Expanse 8b or GPT-5.3 Codex better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 33.8 in the Noometry coding category.
How many benchmarks do C4ai Aya Expanse 8b and GPT-5.3 Codex share?
0 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and GPT-5.3 Codex has 8.