Model comparison
GPT-5-Codex vs Granite 4.2 3b
Granite 4.2 3b is the stronger model overall, scoring 39.0 to 37.3 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in reasoning, where GPT-5-Codex leads 30.0 to 25.0.
- Granite 4.2 3b has downloadable open weights; the other is API-only.
Side by side
| GPT-5-Codex | Granite 4.2 3b | |
|---|---|---|
| Provider | OpenAI | IBM |
| Noometry Index | 37.3 | 39.0 |
| Released | 2025-09-15 | — |
| Weights | Proprietary | Open |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.25 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 3 | 11 |
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Category by category
Coding GPT-5-Codex leads
GPT-5-Codex: 41.9 (#100), Granite 4.2 3b: 39.4 (#146)
| Benchmark | GPT-5-Codex | Granite 4.2 3b |
|---|---|---|
| WeirdML | 54.5% | — |
| LMArena Coding | — | 1363 |
Agentic & Tool Use Not comparable
GPT-5-Codex: 30.8 (#66), Granite 4.2 3b: —
| Benchmark | GPT-5-Codex | Granite 4.2 3b |
|---|---|---|
| Terminal-Bench | 44.3% | — |
Reasoning GPT-5-Codex leads
GPT-5-Codex: 30.0 (#80), Granite 4.2 3b: 25.0 (#136)
| Benchmark | GPT-5-Codex | Granite 4.2 3b |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| LMArena Hard Prompts | — | 1308 |
Knowledge Not comparable
GPT-5-Codex: —, Granite 4.2 3b: 35.6 (#169)
| Benchmark | GPT-5-Codex | Granite 4.2 3b |
|---|---|---|
| LMArena Expert | — | 1313 |
Multilingual Not comparable
GPT-5-Codex: —, Granite 4.2 3b: 42.4 (#193)
| Benchmark | GPT-5-Codex | Granite 4.2 3b |
|---|---|---|
| LMArena Non-English | — | 1268 |
| LMArena Chinese | — | 1268 |
| LMArena Russian | — | 1249 |
Instruction Following Not comparable
GPT-5-Codex: —, Granite 4.2 3b: 67.2 (#195)
| Benchmark | GPT-5-Codex | Granite 4.2 3b |
|---|---|---|
| LMArena Instruction Following | — | 1271 |
Long Context Not comparable
GPT-5-Codex: —, Granite 4.2 3b: 39.3 (#179)
| Benchmark | GPT-5-Codex | Granite 4.2 3b |
|---|---|---|
| LMArena Longer Query | — | 1293 |
Writing & Preference Not comparable
GPT-5-Codex: —, Granite 4.2 3b: 47.9 (#202)
| Benchmark | GPT-5-Codex | Granite 4.2 3b |
|---|---|---|
| LMArena Text | — | 1295 |
| LMArena Creative Writing | — | 1215 |
| LMArena Multi-Turn | — | 1293 |
Frequently asked questions
Is GPT-5-Codex better than Granite 4.2 3b?
Granite 4.2 3b is the stronger model overall, scoring 39.0 to 37.3 on the Noometry Index.
Is GPT-5-Codex or Granite 4.2 3b better for coding?
GPT-5-Codex scores higher on coding benchmarks: 41.9 versus 39.4 in the Noometry coding category.
How many benchmarks do GPT-5-Codex and Granite 4.2 3b share?
0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Granite 4.2 3b has 11.