# GPT-6 Luna vs Seed 2.1 Pro

> Side-by-side benchmark comparison for GPT-6 Luna and Seed 2.1 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-6-luna-vs-seed-2-1-pro
- Last updated: September 23, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.6

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for GPT-6 Luna and Seed 2.1 Pro.

## Summary

- GPT-6 Luna 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-6 Luna | Seed 2.1 Pro |
|----------|----------|----------|
| Creator | OpenAI | ByteDance |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 256K |
| Independent public score (not head-to-head) | 66.52 | null |
| Benchmarks Covered | 7 | 11 |
| Pricing (input/output) | $0.10 / $0.50 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-6 Luna public-lane score: 55.4 (Estimated · #26/105)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | GPT-6 Luna | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| ExploitGym | 11.6% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 71.0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-6 Luna public-lane score: 53.9 (Supported · #32/135)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | GPT-6 Luna | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| DeepSWE | 66.6% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 71.0% | Coming soon |
| NL2Repo | Coming soon | 47% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-6 Luna public-lane score: 78.3 (#6/18)
- Seed 2.1 Pro public-lane score: Coming soon

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-6 Luna public-lane score: 71.3 (Unranked · 1 rankable row)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | GPT-6 Luna | 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 |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-6 Luna public-lane score: 66.3 (Estimated · #18/160)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | GPT-6 Luna | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| HealthBench (raw) | 50.0% | Coming soon | Coming soon |
| HealthBench (length-adjusted) | 54.5% | Coming soon | Coming soon |
| HealthBench Professional | 60.8% | Coming soon | Coming soon |
| HealthBench Professional (raw) | 61.2% | Coming soon | Coming soon |
| HealthBench Hard | 31.4% | Coming soon | Coming soon |
| SuperGPQA | Coming soon | 70.8% | Coming soon |

## FAQ

### Can I compare GPT-6 Luna 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-6 Luna vs GPT-6 Astra](/compare/gpt-6-astra-vs-gpt-6-luna)
- [Seed 2.1 Pro vs GPT-6 Astra](/compare/gpt-6-astra-vs-seed-2-1-pro)
- [GPT-6 Luna vs GPT-6 Sol](/compare/gpt-6-luna-vs-gpt-6-sol)
- [Seed 2.1 Pro vs GPT-6 Sol](/compare/gpt-6-sol-vs-seed-2-1-pro)

## Explore More

- [GPT-6 Luna profile](/models/gpt-6-luna)
- [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)