# GPT-5.1-Codex vs Hy3 Preview

> Side-by-side benchmark comparison for GPT-5.1-Codex and Hy3 Preview across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-1-codex-vs-hy3-preview
- Last updated: September 23, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.6

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.1-Codex and Hy3 Preview share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Hy3 Preview has the lower published output-token price.
- GPT-5.1-Codex has the larger published context window at 400K.

## Model Snapshot

| Property | GPT-5.1-Codex | Hy3 Preview |
|----------|----------|----------|
| Creator | OpenAI | Tencent |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 256K |
| Independent public score (not head-to-head) | 44.54 | 45.32 |
| Benchmarks Covered | 4 | 6 |
| Pricing (input/output) | $1.25 / $10.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.1-Codex public-lane score: Coming soon
- Hy3 Preview public-lane score: Coming soon

| Benchmark | GPT-5.1-Codex | Hy3 Preview | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 49.68% | 36.91% | GPT-5.1-Codex |
| JobBench | 26.2% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 54.4% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.1-Codex public-lane score: 36.1 (Estimated · #77/135)
- Hy3 Preview public-lane score: 33.3 (Estimated · #85/135)

| Benchmark | GPT-5.1-Codex | Hy3 Preview | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 13.12% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.6% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 74.4% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 54.4% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.1-Codex public-lane score: 68.6 (Unranked · 2 rankable rows)
- Hy3 Preview public-lane score: Coming soon

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.1-Codex public-lane score: 66.9 (Unranked · 1 rankable row)
- Hy3 Preview public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.1-Codex public-lane score: 47.5 (Estimated · #63/160)
- Hy3 Preview public-lane score: 39.1 (Estimated · #93/160)

| Benchmark | GPT-5.1-Codex | Hy3 Preview | Winner |
|-----------|-----------|-----------|--------|
| GPQA | Coming soon | 87.2% | Coming soon |
| GPQA-D | Coming soon | 87.2% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.1-Codex public-lane score: 84.2 (#42/124)
- Hy3 Preview public-lane score: 46.9 (#86/124)

## FAQ

### Is there enough evidence to pick between GPT-5.1-Codex and Hy3 Preview?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [GPT-5.1-Codex vs Hy3](/compare/gpt-5-1-codex-vs-hy3)
- [Hy3 Preview vs Hy3](/compare/hy3-vs-hy3-preview)
- [GPT-5.1-Codex vs GPT-6 Astra](/compare/gpt-5-1-codex-vs-gpt-6-astra)
- [Hy3 Preview vs GPT-6 Astra](/compare/gpt-6-astra-vs-hy3-preview)

## Explore More

- [GPT-5.1-Codex profile](/models/gpt-5-1-codex)
- [Hy3 Preview profile](/models/hy3-preview)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)