# Flint vs Mellum2.1-12B-A2.5B-Thinking

> Side-by-side benchmark comparison for Flint and Mellum2.1-12B-A2.5B-Thinking across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/flint-40b-a2-5b-vs-mellum2-1-12b-a2-5b-thinking
- Last updated: October 20, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Flint if you want the stronger benchmark profile. Mellum2.1-12B-A2.5B-Thinking only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Flint leads overall 67 to 39.
- The biggest single benchmark swing is Terminal-Bench 2.1 in Agentic, with scores of 54.9% and 17.4%.
- Flint also has the larger context window at 256K.

## Model Snapshot

| Property | Flint | Mellum2.1-12B-A2.5B-Thinking |
|----------|----------|----------|
| Creator | Recursive | JetBrains |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 256K | 128K |
| Overall Score | null | null |
| Benchmarks Covered | 5 | 7 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Flint public-lane score: Coming soon
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Flint | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 54.9% | 17.4% | Flint |

### Coding

- Winner: Not comparable
- Flint public-lane score: Coming soon
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Flint | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 74.2% | 47% | Flint |
| LiveCodeBench v6 | 80.3% | 82.0% | Mellum2.1-12B-A2.5B-Thinking |
| SWE-bench Pro | Coming soon | 28% | Coming soon |

### Knowledge

- Winner: Not comparable
- Flint public-lane score: Coming soon
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Flint | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| MMLU-Redux | Coming soon | 87.8% | Coming soon |
| GPQA-D | Coming soon | 64.6% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Flint public-lane score: 94.7 (#3/152)
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Flint | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 89.2% | Coming soon | Coming soon |
| IFEval | 95.1% | 90.6% | Flint |

## FAQ

### Which is better overall, Flint or Mellum2.1-12B-A2.5B-Thinking?

Flint is ahead overall on BenchLM right now.

### How many benchmarks does Flint cover on BenchLM?

Flint currently has 5 sourced benchmark scores on BenchLM.

### How many benchmarks does Mellum2.1-12B-A2.5B-Thinking cover on BenchLM?

Mellum2.1-12B-A2.5B-Thinking currently has 7 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Flint vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-flint-40b-a2-5b)
- [Mellum2.1-12B-A2.5B-Thinking vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-mellum2-1-12b-a2-5b-thinking)
- [Flint vs GPT-6.1 Sol](/compare/flint-40b-a2-5b-vs-gpt-6-1-sol)
- [Mellum2.1-12B-A2.5B-Thinking vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-mellum2-1-12b-a2-5b-thinking)

## Explore More

- [Flint profile](/models/flint-40b-a2-5b)
- [Mellum2.1-12B-A2.5B-Thinking profile](/models/mellum2-1-12b-a2-5b-thinking)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)