# GPT-5.3 Codex vs LongCat-2.5

> Side-by-side benchmark comparison for GPT-5.3 Codex and LongCat-2.5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-3-codex-vs-longcat-2-5
- Last updated: November 9, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.3 Codex and LongCat-2.5 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.
- LongCat-2.5 has the lower published output-token price.
- LongCat-2.5 has the larger published context window at 1M.

## Model Snapshot

| Property | GPT-5.3 Codex | LongCat-2.5 |
|----------|----------|----------|
| Creator | OpenAI | Meituan |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Hybrid |
| Context | 400K | 1M |
| Independent public score (not head-to-head) | 62.32 | null |
| Benchmarks Covered | 11 | 22 |
| Pricing (input/output) | $1.75 / $14.00 | $0.30 / $1.20 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 56.2 (Estimated · #40/132)
- LongCat-2.5 public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | LongCat-2.5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 77.3% | Coming soon | Coming soon |
| OSWorld-Verified | 64.7% | Coming soon | Coming soon |
| Gert Labs | 57.47% | Coming soon | Coming soon |
| JobBench | 33.7% | 65.4% | LongCat-2.5 |
| Terminal-Bench 2.1 | Coming soon | 88.4% | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 38.50% | Coming soon |
| BrowseComp | Coming soon | 91.9% | Coming soon |
| AutomationBench | Coming soon | 51.8% | Coming soon |
| HLE w/ tools | Coming soon | 63.1% | Coming soon |
| Agents' Last Exam | Coming soon | 38.5% | Coming soon |
| MCP Atlas | Coming soon | 83.1% | Coming soon |
| skillsBench | Coming soon | 63.3% | Coming soon |
| SpreadsheetBench 2 | Coming soon | 34.9% | Coming soon |
| Claw-Eval | Coming soon | 78.3% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 53.3 (Supported · #38/158)
- LongCat-2.5 public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | LongCat-2.5 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 85% | Coming soon | Coming soon |
| SWE-bench Pro | 56.8% | Coming soon | Coming soon |
| SWE-Rebench | 58.2% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 77.3% | Coming soon | Coming soon |
| Vibe Code Bench | 61.77% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.3% | Coming soon | Coming soon |
| SWE-bench (Vals) | 78.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 88.4% | Coming soon |
| ProgramBench | Coming soon | 25.5% | Coming soon |
| DeepSWE | Coming soon | 64.6% | Coming soon |
| PaperBench | Coming soon | 82.1% | Coming soon |
| SWE-Atlas Codebase QnA | Coming soon | 58.3% | Coming soon |
| NL2Repo | Coming soon | 60.5% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 58.3 (Estimated · #35/157)
- LongCat-2.5 public-lane score: Coming soon

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: Coming soon
- LongCat-2.5 public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | LongCat-2.5 | Winner |
|-----------|-----------|-----------|--------|
| Vision2Web | Coming soon | 78.6% | Coming soon |
| CharXiv | Coming soon | 90.2% | Coming soon |
| MathVision w/ Python | Coming soon | 96.5% | Coming soon |
| Video-MME | Coming soon | 85.2% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 63.6 (Estimated · #37/179)
- LongCat-2.5 public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | LongCat-2.5 | Winner |
|-----------|-----------|-----------|--------|
| FrontierScience | Coming soon | 77% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 92.6 (#19/157)
- LongCat-2.5 public-lane score: Coming soon

## FAQ

### Is there enough evidence to pick between GPT-5.3 Codex and LongCat-2.5?

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-5.3 Codex vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-vs-gpt-5-3-codex-spark)
- [LongCat-2.5 vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-spark-vs-longcat-2-5)
- [GPT-5.3 Codex vs Claude Fable 5.2](/compare/claude-fable-5-2-vs-gpt-5-3-codex)
- [LongCat-2.5 vs Claude Fable 5.2](/compare/claude-fable-5-2-vs-longcat-2-5)

## Explore More

- [GPT-5.3 Codex profile](/models/gpt-5-3-codex)
- [LongCat-2.5 profile](/models/longcat-2-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)