Model comparison
GPT-5.1-Codex vs Hy3
Hy3 is the stronger model overall, scoring 44.2 to 38.6 on the Noometry Index.
Last verified . 1 shared benchmarks.
TencentSummary
- They share 1 benchmark with published results for both. GPT-5.1-Codex scores higher in 0 categories and Hy3 in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in math, where Hy3 leads 40.1 to 30.3.
- Hy3 is cheaper at $0.0825 / $0.33 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 262K.
- Hy3 has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1-Codex | Hy3 | |
|---|---|---|
| Provider | OpenAI | Tencent |
| Noometry Index | 38.6 | 44.2 |
| Released | 2025-11-12 | 2026-07-06 |
| Weights | Proprietary | Open |
| Context window | 400K | 262K |
| Max output | 128K | 128K |
| Input $ / M tokens | $1.25 | $0.0825 |
| Output $ / M tokens | $10 | $0.33 |
| Results tracked | 6 | 19 |
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Category by category
Coding Hy3 leads
GPT-5.1-Codex: 41.9 (#116), Hy3: 46.8 (#63)
| Benchmark | GPT-5.1-Codex | Hy3 |
|---|---|---|
| LMArena WebDev | 1337 | 1508 |
| SWE-bench Verified (bash only) | 66% | — |
| LMArena Coding | — | 1464 |
| ALE-Bench | 1,245 | — |
Agentic & Tool Use Not comparable
GPT-5.1-Codex: 38.0 (#33), Hy3: —
| Benchmark | GPT-5.1-Codex | Hy3 |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Hy3: 26.1 (#136)
| Benchmark | GPT-5.1-Codex | Hy3 |
|---|---|---|
| NYT Connections (extended) | — | 41.2% |
| LMArena Hard Prompts | — | 1447 |
Math Hy3 leads
GPT-5.1-Codex: 30.3 (#235), Hy3: 40.1 (#93)
| Benchmark | GPT-5.1-Codex | Hy3 |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1475 |
Knowledge Not comparable
GPT-5.1-Codex: —, Hy3: 40.8 (#114)
| Benchmark | GPT-5.1-Codex | Hy3 |
|---|---|---|
| LMArena Expert | — | 1460 |
Multilingual Not comparable
GPT-5.1-Codex: —, Hy3: 53.5 (#65)
| Benchmark | GPT-5.1-Codex | Hy3 |
|---|---|---|
| LMArena Non-English | — | 1426 |
| LMArena Chinese | — | 1493 |
| LMArena French | — | 1461 |
| LMArena German | — | 1439 |
| LMArena Japanese | — | 1392 |
| LMArena Korean | — | 1395 |
| LMArena Russian | — | 1432 |
| LMArena Spanish | — | 1456 |
Instruction Following Not comparable
GPT-5.1-Codex: —, Hy3: 75.1 (#70)
| Benchmark | GPT-5.1-Codex | Hy3 |
|---|---|---|
| LMArena Instruction Following | — | 1426 |
Long Context Not comparable
GPT-5.1-Codex: —, Hy3: 44.1 (#75)
| Benchmark | GPT-5.1-Codex | Hy3 |
|---|---|---|
| LMArena Longer Query | — | 1442 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, Hy3: 62.2 (#81)
| Benchmark | GPT-5.1-Codex | Hy3 |
|---|---|---|
| LMArena Text | — | 1439 |
| LMArena Creative Writing | — | 1402 |
| LMArena Multi-Turn | — | 1436 |
Frequently asked questions
Is GPT-5.1-Codex better than Hy3?
Hy3 is the stronger model overall, scoring 44.2 to 38.6 on the Noometry Index.
Which is cheaper, GPT-5.1-Codex or Hy3?
Hy3 is cheaper. It lists at $0.0825 per million input tokens and $0.33 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.
Is GPT-5.1-Codex or Hy3 better for coding?
Hy3 scores higher on coding benchmarks: 46.8 versus 41.9 in the Noometry coding category.
Which has the bigger context window?
GPT-5.1-Codex does, with 400K tokens against 262K.
How many benchmarks do GPT-5.1-Codex and Hy3 share?
1 benchmark has published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Hy3 has 19.