# Composer 2 Fast vs GPT-5.4 mini

> Side-by-side benchmark comparison for Composer 2 Fast and GPT-5.4 mini across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/composer-2-fast-vs-gpt-5-4-mini
- Last updated: September 10, 2026

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

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for Composer 2 Fast and GPT-5.4 mini.

## Summary

- Composer 2 Fast and GPT-5.4 mini 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 | Composer 2 Fast | GPT-5.4 mini |
|----------|----------|----------|
| Creator | Cursor | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 200K | 400K |
| Independent public score (not head-to-head) | null | 61.11 |
| Benchmarks Covered | 1 | 19 |
| Pricing (input/output) | N/A | $0.75 / $4.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Composer 2 Fast public-lane score: Coming soon
- GPT-5.4 mini public-lane score: 39.1 (Estimated · #119/152)

| Benchmark | Composer 2 Fast | GPT-5.4 mini | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | Coming soon | 60% | Coming soon |
| OSWorld-Verified | Coming soon | 72.1% | Coming soon |
| MCP Atlas | Coming soon | 57.7% | Coming soon |
| Toolathlon | Coming soon | 42.9% | Coming soon |
| τ²-bench results | Coming soon | 93.4% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 54.7% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Composer 2 Fast public-lane score: Coming soon
- GPT-5.4 mini public-lane score: 42.7 (Supported · #104/151)

| Benchmark | Composer 2 Fast | GPT-5.4 mini | Winner |
|-----------|-----------|-----------|--------|
| React Native Evals | 94.9% | Coming soon | Coming soon |
| Vibe Code Bench | Coming soon | 47.97% | Coming soon |
| FrontierCode 1.1 Main | Coming soon | 27.0% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 81.5% | Coming soon |
| SWE-bench (Vals) | Coming soon | 73.0% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Composer 2 Fast public-lane score: Coming soon
- GPT-5.4 mini public-lane score: 57.2 (#31/48)

| Benchmark | Composer 2 Fast | GPT-5.4 mini | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | Coming soon | 76.6% | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 78% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Composer 2 Fast public-lane score: Coming soon
- GPT-5.4 mini public-lane score: 73.9 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Insufficient shared evidence
- Composer 2 Fast public-lane score: Coming soon
- GPT-5.4 mini public-lane score: 55.6 (Supported · #52/183)

| Benchmark | Composer 2 Fast | GPT-5.4 mini | Winner |
|-----------|-----------|-----------|--------|
| GPQA | Coming soon | 88% | Coming soon |
| HLE | Coming soon | 41.5% | Coming soon |
| HLE w/o tools | Coming soon | 28.2% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 83.1% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 84.6% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Composer 2 Fast public-lane score: Coming soon
- GPT-5.4 mini public-lane score: 89.8 (#23/123)

### Mathematics

- Winner: Insufficient shared evidence
- Composer 2 Fast public-lane score: Coming soon
- GPT-5.4 mini public-lane score: 44.5 (Unranked · 2 rankable rows)

| Benchmark | Composer 2 Fast | GPT-5.4 mini | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | Coming soon | 28.280% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 2.080% | Coming soon |

## FAQ

### Can I compare Composer 2 Fast and GPT-5.4 mini 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

- [Composer 2 Fast vs Composer 2.5](/compare/composer-2-5-vs-composer-2-fast)
- [GPT-5.4 mini vs Composer 2.5](/compare/composer-2-5-vs-gpt-5-4-mini)
- [Composer 2 Fast vs Composer 2](/compare/composer-2-vs-composer-2-fast)
- [GPT-5.4 mini vs Composer 2](/compare/composer-2-vs-gpt-5-4-mini)

## Explore More

- [Composer 2 Fast profile](/models/composer-2-fast)
- [GPT-5.4 mini profile](/models/gpt-5-4-mini)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)