# GPT-6.1 Sol vs Mistral Medium 3.5 128B

> Side-by-side benchmark comparison for GPT-6.1 Sol and Mistral Medium 3.5 128B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-6-1-sol-vs-mistral-medium-3-5-128b
- Last updated: September 29, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for GPT-6.1 Sol and Mistral Medium 3.5 128B.

## Summary

- GPT-6.1 Sol and Mistral Medium 3.5 128B 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-6.1 Sol | Mistral Medium 3.5 128B |
|----------|----------|----------|
| Creator | OpenAI | Mistral |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 256K |
| Independent public score (not head-to-head) | 66.86 | 36.09 |
| Benchmarks Covered | 9 | 7 |
| Pricing (input/output) | $2.00 / $10.00 | $1.50 / $7.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-6.1 Sol public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 19.7 (Supported · #100/117)

| Benchmark | GPT-6.1 Sol | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| AutomationBench | 36.1% | Coming soon | Coming soon |
| Terminal-Bench-Science 0.1 | 57.0% | Coming soon | Coming soon |
| ExploitGym | 35.1% | Coming soon | Coming soon |
| τ³-bench results | Coming soon | 91.4% | Coming soon |
| Gert Labs | Coming soon | 39.10% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 39.0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-6.1 Sol public-lane score: 67 (Supported · #8/143)
- Mistral Medium 3.5 128B public-lane score: 26.6 (Estimated · #102/143)

| Benchmark | GPT-6.1 Sol | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| DeepSWE | 71.9% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 77.6% | Coming soon |
| SWE-bench (Vals) | Coming soon | 66.4% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-6.1 Sol public-lane score: 79.4 (Unranked · 2 rankable rows)
- Mistral Medium 3.5 128B public-lane score: 69.9 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-6.1 Sol public-lane score: 83.9 (Unranked · 1 rankable row)
- Mistral Medium 3.5 128B public-lane score: 56.7 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- GPT-6.1 Sol public-lane score: 71.3 (Estimated · #10/169)
- Mistral Medium 3.5 128B public-lane score: 33.6 (Supported · #121/169)

| Benchmark | GPT-6.1 Sol | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| HealthBench (raw) | 56.7% | Coming soon | Coming soon |
| HealthBench (length-adjusted) | 58.5% | Coming soon | Coming soon |
| HealthBench Professional | 64.2% | Coming soon | Coming soon |
| HealthBench Professional (raw) | 67.2% | Coming soon | Coming soon |
| HealthBench Hard | 36.2% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 34.8% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 75.3% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-6.1 Sol public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 82.6 (#48/124)

## FAQ

### Can I compare GPT-6.1 Sol and Mistral Medium 3.5 128B 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-6.1 Sol vs GPT-6 Astra](/compare/gpt-6-1-sol-vs-gpt-6-astra)
- [Mistral Medium 3.5 128B vs GPT-6 Astra](/compare/gpt-6-astra-vs-mistral-medium-3-5-128b)
- [GPT-6.1 Sol vs GPT-6 Sol](/compare/gpt-6-1-sol-vs-gpt-6-sol)
- [Mistral Medium 3.5 128B vs GPT-6 Sol](/compare/gpt-6-sol-vs-mistral-medium-3-5-128b)

## Explore More

- [GPT-6.1 Sol profile](/models/gpt-6-1-sol)
- [Mistral Medium 3.5 128B profile](/models/mistral-medium-3-5-128b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)