Model comparison
Amazon Nova Micro vs GPT-5.1-Codex
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 30.4 on the Noometry Index. Amazon Nova Micro costs 56× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in agentic & tool use, where GPT-5.1-Codex leads 38.0 to 22.1.
- Amazon Nova Micro is cheaper at $0.035 / $0.14 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 128K.
Side by side
| Amazon Nova Micro | GPT-5.1-Codex | |
|---|---|---|
| Provider | Amazon | OpenAI |
| Noometry Index | 30.4 | 38.6 |
| Released | 2024-12-03 | 2025-11-12 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | 400K |
| Max output | 10K | 128K |
| Input $ / M tokens | $0.035 | $1.25 |
| Output $ / M tokens | $0.14 | $10 |
| Results tracked | 32 | 6 |
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Category by category
Coding GPT-5.1-Codex leads
Amazon Nova Micro: 30.5 (#295), GPT-5.1-Codex: 41.9 (#116)
| Benchmark | Amazon Nova Micro | GPT-5.1-Codex |
|---|---|---|
| SWE-bench Verified (bash only) | — | 66% |
| LMArena WebDev | — | 1337 |
| LiveBench Coding | 20.2% | — |
| LMArena Coding | 1218 | — |
| ALE-Bench | — | 1,245 |
Agentic & Tool Use GPT-5.1-Codex leads
Amazon Nova Micro: 22.1 (#132), GPT-5.1-Codex: 38.0 (#33)
| Benchmark | Amazon Nova Micro | GPT-5.1-Codex |
|---|---|---|
| Terminal-Bench | — | 60.4% |
| Berkeley Function Calling Leaderboard | 22.3% | — |
| METR Time Horizons | — | 70.8% |
Reasoning Not comparable
Amazon Nova Micro: 17.4 (#294), GPT-5.1-Codex: —
| Benchmark | Amazon Nova Micro | GPT-5.1-Codex |
|---|---|---|
| LiveBench Reasoning | 25.1% | — |
| LMArena Hard Prompts | 1191 | — |
| LiveBench Data Analysis | 34% | — |
| LiveBench | 29.6% | — |
Math GPT-5.1-Codex leads
Amazon Nova Micro: 26.9 (#254), GPT-5.1-Codex: 30.3 (#235)
| Benchmark | Amazon Nova Micro | GPT-5.1-Codex |
|---|---|---|
| ProofBench | — | 9% |
| Omni-MATH | 21.4% | — |
| LiveBench Math | 34.5% | — |
| LMArena Math | 1206 | — |
Knowledge Not comparable
Amazon Nova Micro: 29.6 (#237), GPT-5.1-Codex: —
| Benchmark | Amazon Nova Micro | GPT-5.1-Codex |
|---|---|---|
| MMLU-Pro | 51.1% | — |
| Vectara Hallucination Rate | 5.5% | — |
| GPQA (HELM) | 38.3% | — |
| LMArena Expert | 1184 | — |
| MMLU | 70.8% | — |
Multilingual Not comparable
Amazon Nova Micro: 36.5 (#239), GPT-5.1-Codex: —
| Benchmark | Amazon Nova Micro | GPT-5.1-Codex |
|---|---|---|
| LMArena Non-English | 1186 | — |
| LMArena Chinese | 1209 | — |
| LMArena French | 1238 | — |
| LMArena German | 1192 | — |
| LMArena Japanese | 1154 | — |
| LMArena Korean | 1150 | — |
| LMArena Russian | 1185 | — |
| LMArena Spanish | 1225 | — |
Instruction Following Not comparable
Amazon Nova Micro: 56.3 (#272), GPT-5.1-Codex: —
| Benchmark | Amazon Nova Micro | GPT-5.1-Codex |
|---|---|---|
| LiveBench Instruction Following | 48% | — |
| IFEval | 76% | — |
| LMArena Instruction Following | 1174 | — |
Long Context Not comparable
Amazon Nova Micro: 36.5 (#229), GPT-5.1-Codex: —
| Benchmark | Amazon Nova Micro | GPT-5.1-Codex |
|---|---|---|
| LMArena Longer Query | 1205 | — |
Writing & Preference Not comparable
Amazon Nova Micro: 39.5 (#247), GPT-5.1-Codex: —
| Benchmark | Amazon Nova Micro | GPT-5.1-Codex |
|---|---|---|
| LMArena Text | 1208 | — |
| LMArena Creative Writing | 1172 | — |
| WildBench | 74.3% | — |
| LMArena Multi-Turn | 1178 | — |
| LiveBench Language | 15.8% | — |
Frequently asked questions
Is Amazon Nova Micro better than GPT-5.1-Codex?
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 30.4 on the Noometry Index. Amazon Nova Micro costs 56× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.
Which is cheaper, Amazon Nova Micro or GPT-5.1-Codex?
Amazon Nova Micro is cheaper. It lists at $0.035 per million input tokens and $0.14 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.
Is Amazon Nova Micro or GPT-5.1-Codex better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.9 versus 30.5 in the Noometry coding category.
Which has the bigger context window?
GPT-5.1-Codex does, with 400K tokens against 128K.
How many benchmarks do Amazon Nova Micro and GPT-5.1-Codex share?
0 benchmarks have published results for both models. Amazon Nova Micro has 32 scored results on Noometry and GPT-5.1-Codex has 6.