Model comparison
GPT-5-Codex vs Granite 4.2 30b
Granite 4.2 30b is the stronger model overall, scoring 41.8 to 37.9 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in reasoning, where GPT-5-Codex leads 30.9 to 27.8.
- Granite 4.2 30b has downloadable open weights; the other is API-only.
Side by side
| GPT-5-Codex | Granite 4.2 30b | |
|---|---|---|
| Provider | OpenAI | IBM |
| Noometry Index | 37.9 | 41.8 |
| 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: 42.4 (#103), Granite 4.2 30b: 41.0 (#126)
| Benchmark | GPT-5-Codex | Granite 4.2 30b |
|---|---|---|
| WeirdML | 54.5% | — |
| LMArena Coding | — | 1396 |
Agentic & Tool Use Not comparable
GPT-5-Codex: 31.0 (#72), Granite 4.2 30b: —
| Benchmark | GPT-5-Codex | Granite 4.2 30b |
|---|---|---|
| Terminal-Bench | 44.3% | — |
Reasoning GPT-5-Codex leads
GPT-5-Codex: 30.9 (#83), Granite 4.2 30b: 27.8 (#112)
| Benchmark | GPT-5-Codex | Granite 4.2 30b |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| LMArena Hard Prompts | — | 1374 |
Knowledge Not comparable
GPT-5-Codex: —, Granite 4.2 30b: 39.1 (#138)
| Benchmark | GPT-5-Codex | Granite 4.2 30b |
|---|---|---|
| LMArena Expert | — | 1406 |
Multilingual Not comparable
GPT-5-Codex: —, Granite 4.2 30b: 47.3 (#151)
| Benchmark | GPT-5-Codex | Granite 4.2 30b |
|---|---|---|
| LMArena Non-English | — | 1340 |
| LMArena Chinese | — | 1414 |
| LMArena Russian | — | 1343 |
Instruction Following Not comparable
GPT-5-Codex: —, Granite 4.2 30b: 71.2 (#155)
| Benchmark | GPT-5-Codex | Granite 4.2 30b |
|---|---|---|
| LMArena Instruction Following | — | 1347 |
Long Context Not comparable
GPT-5-Codex: —, Granite 4.2 30b: 41.4 (#140)
| Benchmark | GPT-5-Codex | Granite 4.2 30b |
|---|---|---|
| LMArena Longer Query | — | 1359 |
Writing & Preference Not comparable
GPT-5-Codex: —, Granite 4.2 30b: 53.8 (#156)
| Benchmark | GPT-5-Codex | Granite 4.2 30b |
|---|---|---|
| LMArena Text | — | 1361 |
| LMArena Creative Writing | — | 1288 |
| LMArena Multi-Turn | — | 1339 |
Frequently asked questions
Is GPT-5-Codex better than Granite 4.2 30b?
Granite 4.2 30b is the stronger model overall, scoring 41.8 to 37.9 on the Noometry Index.
Is GPT-5-Codex or Granite 4.2 30b better for coding?
GPT-5-Codex scores higher on coding benchmarks: 42.4 versus 41.0 in the Noometry coding category.
How many benchmarks do GPT-5-Codex and Granite 4.2 30b share?
0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Granite 4.2 30b has 11.