# GPT-6.1 Terra vs Seed 2.1 Pro

> Side-by-side benchmark comparison for GPT-6.1 Terra and Seed 2.1 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-6-1-terra-vs-seed-2-1-pro
- Last updated: October 26, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-6.1 Terra and Seed 2.1 Pro 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.
- Seed 2.1 Pro has the lower published output-token price.
- GPT-6.1 Terra has the larger published context window at 1.05M.

## Model Snapshot

| Property | GPT-6.1 Terra | Seed 2.1 Pro |
|----------|----------|----------|
| Creator | OpenAI | ByteDance |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 256K |
| Independent public score (not head-to-head) | 75.87 | null |
| Benchmarks Covered | 10 | 11 |
| Pricing (input/output) | $1.00 / $5.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-6.1 Terra public-lane score: 72.4 (Estimated · #8/133)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | GPT-6.1 Terra | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 50.30% | Coming soon | Coming soon |
| Terminal-Bench-Science 0.1 | 58.3% | Coming soon | Coming soon |
| Agents' Last Exam | 60.0% | Coming soon | Coming soon |
| OSWorld 2.1 Offline | 74.2% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 71.0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-6.1 Terra public-lane score: Coming soon
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | GPT-6.1 Terra | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | Coming soon | 71.0% | Coming soon |
| NL2Repo | Coming soon | 47% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-6.1 Terra public-lane score: 81.8 (Unranked · 2 rankable rows)
- Seed 2.1 Pro public-lane score: Coming soon

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-6.1 Terra public-lane score: 91.6 (#4/58)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | GPT-6.1 Terra | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 85.5% | 81.6% | GPT-6.1 Terra |
| MathVision | Coming soon | 92.6% | 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-6.1 Terra public-lane score: 74.9 (Supported · #12/188)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | GPT-6.1 Terra | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| HealthBench (raw) | 51.1% | Coming soon | Coming soon |
| HealthBench (length-adjusted) | 55.1% | Coming soon | Coming soon |
| HealthBench Professional | 62.7% | Coming soon | Coming soon |
| HealthBench Professional (raw) | 64.2% | Coming soon | Coming soon |
| HealthBench Hard | 31.4% | Coming soon | Coming soon |
| SuperGPQA | Coming soon | 70.8% | Coming soon |

## FAQ

### Is there enough evidence to pick between GPT-6.1 Terra and Seed 2.1 Pro?

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-6.1 Terra vs GPT-6 Astra](/compare/gpt-6-1-terra-vs-gpt-6-astra)
- [Seed 2.1 Pro vs GPT-6 Astra](/compare/gpt-6-astra-vs-seed-2-1-pro)
- [GPT-6.1 Terra vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-gpt-6-1-terra)
- [Seed 2.1 Pro vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-seed-2-1-pro)

## Explore More

- [GPT-6.1 Terra profile](/models/gpt-6-1-terra)
- [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)