Model comparison
GPT-5.3 Codex vs Hy3
GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 43.6 on the Noometry Index. Hy3 costs 21× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.
Last verified . 1 shared benchmarks.
TencentSummary
- They share 1 benchmark with published results for both. GPT-5.3 Codex scores higher in 1 category and Hy3 in 0 categories; one gap is clear of the uncertainty.
- Hy3 is cheaper at $0.13 / $0.53 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- GPT-5.3 Codex accepts more context: 400K tokens versus 262K.
- Hy3 has downloadable open weights; the other is API-only.
Side by side
| GPT-5.3 Codex | Hy3 | |
|---|---|---|
| Provider | OpenAI | Tencent |
| Noometry Index | 45.5 | 43.6 |
| Released | 2026-02-05 | 2026-07-06 |
| Weights | Proprietary | Open |
| Context window | 400K | 262K |
| Max output | 128K | 128K |
| Input $ / M tokens | $1.75 | $0.13 |
| Output $ / M tokens | $14 | $0.53 |
| Results tracked | 8 | 17 |
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Category by category
Coding GPT-5.3 Codex leads
GPT-5.3 Codex: 48.5 (#51), Hy3: 46.6 (#60)
| Benchmark | GPT-5.3 Codex | Hy3 |
|---|---|---|
| LMArena WebDev | 1408 | 1509 |
| SWE-bench Verified | 74.8% | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1465 |
| ALE-Bench | 1,655 | — |
Agentic & Tool Use Not comparable
GPT-5.3 Codex: 47.8 (#9), Hy3: —
| Benchmark | GPT-5.3 Codex | Hy3 |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |
Reasoning Not comparable
GPT-5.3 Codex: —, Hy3: 25.0 (#134)
| Benchmark | GPT-5.3 Codex | Hy3 |
|---|---|---|
| NYT Connections (extended) | — | 41.2% |
| LMArena Hard Prompts | — | 1449 |
| Epoch Capabilities Index | 156.84 | — |
Math Not comparable
GPT-5.3 Codex: —, Hy3: 37.4 (#98)
| Benchmark | GPT-5.3 Codex | Hy3 |
|---|---|---|
| LMArena Math | — | 1475 |
Knowledge Not comparable
GPT-5.3 Codex: —, Hy3: 40.2 (#108)
| Benchmark | GPT-5.3 Codex | Hy3 |
|---|---|---|
| LMArena Expert | — | 1461 |
Multilingual Not comparable
GPT-5.3 Codex: —, Hy3: 53.7 (#60)
| Benchmark | GPT-5.3 Codex | Hy3 |
|---|---|---|
| LMArena Non-English | — | 1427 |
| LMArena Chinese | — | 1496 |
| LMArena French | — | 1461 |
| LMArena Korean | — | 1390 |
| LMArena Russian | — | 1435 |
| LMArena Spanish | — | 1448 |
Instruction Following Not comparable
GPT-5.3 Codex: —, Hy3: 75.3 (#68)
| Benchmark | GPT-5.3 Codex | Hy3 |
|---|---|---|
| LMArena Instruction Following | — | 1425 |
Long Context Not comparable
GPT-5.3 Codex: —, Hy3: 44.1 (#70)
| Benchmark | GPT-5.3 Codex | Hy3 |
|---|---|---|
| LMArena Longer Query | — | 1443 |
Writing & Preference Not comparable
GPT-5.3 Codex: —, Hy3: 62.5 (#75)
| Benchmark | GPT-5.3 Codex | Hy3 |
|---|---|---|
| LMArena Text | — | 1442 |
| LMArena Creative Writing | — | 1399 |
| LMArena Multi-Turn | — | 1436 |
Frequently asked questions
Is GPT-5.3 Codex better than Hy3?
GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 43.6 on the Noometry Index. Hy3 costs 21× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.
Which is cheaper, GPT-5.3 Codex or Hy3?
Hy3 is cheaper. It lists at $0.13 per million input tokens and $0.53 per million output tokens; GPT-5.3 Codex lists at $1.75 and $14.
Is GPT-5.3 Codex or Hy3 better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 46.6 in the Noometry coding category.
Which has the bigger context window?
GPT-5.3 Codex does, with 400K tokens against 262K.
How many benchmarks do GPT-5.3 Codex and Hy3 share?
1 benchmark has published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Hy3 has 17.