# Claude Opus 4.5 vs Flint

> Side-by-side benchmark comparison for Claude Opus 4.5 and Flint across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-5-vs-flint-40b-a2-5b
- 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. Claude Opus 4.5 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 54.02.
- The clearest category separation is in instruction following, where the averages are 31.9 for Claude Opus 4.5 and 94.7 for Flint.
- The biggest single benchmark swing is IFBench in Instruction Following, with scores of 58% and 89.2%.
- Flint is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Flint also has the larger context window at 256K.

## Model Snapshot

| Property | Claude Opus 4.5 | Flint |
|----------|----------|----------|
| Creator | Anthropic | Recursive |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 256K |
| Overall Score | 54.02 | null |
| Benchmarks Covered | 61 | 5 |
| Pricing (input/output) | $5.00 / $25.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 32.4 (Estimated · #92/132)
- Flint public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Flint | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 59.3% | Coming soon | Coming soon |
| OSWorld-Verified | 66.3% | Coming soon | Coming soon |
| OSWorld | 66.3% | Coming soon | Coming soon |
| Claw-Eval | 59.6% | Coming soon | Coming soon |
| QwenClawBench | 52.3% | Coming soon | Coming soon |
| τ³-bench results | 70.2% | Coming soon | Coming soon |
| VITA-Bench | 23.3% | Coming soon | Coming soon |
| DeepPlanning | 26.4% | Coming soon | Coming soon |
| Toolathlon | 43.5% | Coming soon | Coming soon |
| MCP Atlas | 42.3% | Coming soon | Coming soon |
| MCP-Tasks | 71.8% | Coming soon | Coming soon |
| WideResearch | 76.4% | Coming soon | Coming soon |
| CyberGym | 50.6% | Coming soon | Coming soon |
| Gert Labs | 64.23% | Coming soon | Coming soon |
| JobBench | 32.3% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 54.9% | Coming soon |

### Coding

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 40.3 (Estimated · #66/153)
- Flint public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Flint | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 80.9% | 74.2% | Claude Opus 4.5 |
| LiveCodeBench v6 | 84.8% | 80.3% | Claude Opus 4.5 |
| SWE-bench Pro | 57.1% | Coming soon | Coming soon |
| SWE Multilingual | 77.5% | Coming soon | Coming soon |
| NL2Repo | 43.2% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 59.3% | Coming soon | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 77.5 (Unranked · 4 rankable rows)
- Flint public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Flint | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | 64.4% | Coming soon | Coming soon |
| AI-Needle | 74% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 48.6 (#50/55)
- Flint public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Flint | Winner |
|-----------|-----------|-----------|--------|
| MMMU | 80.7% | Coming soon | Coming soon |
| MMMU-Pro | 70.6% | Coming soon | Coming soon |
| RealWorldQA | 77.0% | Coming soon | Coming soon |
| OmniDocBench 1.5 | 87.7% | Coming soon | Coming soon |
| Video-MME (with subtitle) | 77.6% | Coming soon | Coming soon |
| Video-MME (w/o subtitle) | 81.4% | Coming soon | Coming soon |
| MathVision | 74.3% | Coming soon | Coming soon |
| We-Math | 70.0% | Coming soon | Coming soon |
| DynaMath | 79.7% | Coming soon | Coming soon |
| SimpleVQA | 65.7% | Coming soon | Coming soon |
| CharXiv | 68.5% | Coming soon | Coming soon |
| CountBench | 90.6% | Coming soon | Coming soon |
| AI2D_TEST | 87.7% | Coming soon | Coming soon |
| ERQA | 46.8% | Coming soon | Coming soon |
| VideoMMMU | 84.4% | Coming soon | Coming soon |
| MLVU (M-Avg) | 81.7% | Coming soon | Coming soon |
| ScreenSpot Pro | 45.7% | Coming soon | Coming soon |
| V* | 67.0% | Coming soon | Coming soon |

### Knowledge

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 51.1 (Estimated · #80/187)
- Flint public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Flint | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 87% | Coming soon | Coming soon |
| SuperGPQA | 70.6% | Coming soon | Coming soon |
| MMLU-Pro | 89.5% | Coming soon | Coming soon |
| MMLU-Redux | 96.6% | Coming soon | Coming soon |
| C-Eval | 92.2% | Coming soon | Coming soon |
| HLE | 30.8% | Coming soon | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 96.5 (#2/17)
- Flint public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Flint | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 85.7% | Coming soon | Coming soon |
| NOVA-63 | 56.7% | Coming soon | Coming soon |
| INCLUDE | 86.2% | Coming soon | Coming soon |
| PolyMath | 79.0% | Coming soon | Coming soon |
| MAXIFE | 79.2% | Coming soon | Coming soon |

### Instruction Following

- Winner: Flint
- Claude Opus 4.5 public-lane score: 31.9 (#135/152)
- Flint public-lane score: 94.7 (#3/152)

| Benchmark | Claude Opus 4.5 | Flint | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 90.9% | 95.1% | Flint |
| IFBench | 58% | 89.2% | Flint |

### Mathematics

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 61.3 (#9/12)
- Flint public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Flint | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 95.1% | Coming soon | Coming soon |
| HMMT Feb 2025 | 92.9% | Coming soon | Coming soon |
| HMMT Nov 2025 | 93.3% | Coming soon | Coming soon |
| HMMT Feb 2026 | 85.3% | Coming soon | Coming soon |
| MMAnswerBench | 84.0% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 34.386% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 4.878% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Opus 4.5 or Flint?

Flint is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Opus 4.5 and Flint?

The widest category gap is in instruction following, where the averages are 31.9 for Claude Opus 4.5 and 94.7 for Flint.

### How many benchmarks does Claude Opus 4.5 cover on BenchLM?

Claude Opus 4.5 currently has 61 sourced benchmark scores on BenchLM.

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

Flint currently has 5 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 4.5 vs Claude Opus 4.5 Thinking](/compare/claude-opus-4-5-vs-claude-opus-4-5-thinking)
- [Flint vs Claude Opus 4.5 Thinking](/compare/claude-opus-4-5-thinking-vs-flint-40b-a2-5b)
- [Claude Opus 4.5 vs Claude Opus 5.5](/compare/claude-opus-4-5-vs-claude-opus-5-5)
- [Flint vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-flint-40b-a2-5b)

## Explore More

- [Claude Opus 4.5 profile](/models/claude-opus-4-5)
- [Flint profile](/models/flint-40b-a2-5b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)