# GPT-5.2-Codex vs Seed 2.1 Pro

> Side-by-side benchmark comparison for GPT-5.2-Codex and Seed 2.1 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-2-codex-vs-seed-2-1-pro
- Last updated: September 10, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for GPT-5.2-Codex and Seed 2.1 Pro.

## Summary

- GPT-5.2-Codex and Seed 2.1 Pro do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | GPT-5.2-Codex | Seed 2.1 Pro |
|----------|----------|----------|
| Creator | OpenAI | ByteDance |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 256K |
| Independent public score (not head-to-head) | 54.19 | null |
| Benchmarks Covered | 3 | 11 |
| Pricing (input/output) | $1.75 / $14.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 50.6 (Estimated · #47/152)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | GPT-5.2-Codex | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 51.79% | Coming soon | Coming soon |
| JobBench | 26.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 71.0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 51.5 (Supported · #50/151)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | GPT-5.2-Codex | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 37.91% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 71.0% | Coming soon |
| NL2Repo | Coming soon | 47% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 72.4 (Unranked · 1 rankable row)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | GPT-5.2-Codex | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| MathVision | Coming soon | 92.6% | Coming soon |
| MMMU-Pro | Coming soon | 81.6% | Coming soon |
| ZeroBench | Coming soon | 18.0% | Coming soon |
| BabyVision | Coming soon | 73.7% | Coming soon |
| CharXiv | Coming soon | 85.4% | Coming soon |
| ERQA | Coming soon | 72.0% | Coming soon |
| Video-MME | Coming soon | 89.2% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 77.6 (Unranked · 2 rankable rows)
- Seed 2.1 Pro public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 56.2 (Estimated · #50/183)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | GPT-5.2-Codex | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| SuperGPQA | Coming soon | 70.8% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 93.7 (#3/123)
- Seed 2.1 Pro public-lane score: Coming soon

## FAQ

### Can I compare GPT-5.2-Codex and Seed 2.1 Pro on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [GPT-5.2-Codex vs Seed 2.1 Turbo](/compare/gpt-5-2-codex-vs-seed-2-1-turbo)
- [Seed 2.1 Pro vs Seed 2.1 Turbo](/compare/seed-2-1-pro-vs-seed-2-1-turbo)
- [GPT-5.2-Codex vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gpt-5-2-codex)
- [Seed 2.1 Pro vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-seed-2-1-pro)

## Explore More

- [GPT-5.2-Codex profile](/models/gpt-5-2-codex)
- [Seed 2.1 Pro profile](/models/seed-2-1-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)