# Grok Code Fast 1 vs Qwen3.5 Flash

> Side-by-side benchmark comparison for Grok Code Fast 1 and Qwen3.5 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/grok-code-fast-1-vs-qwen3-5-flash
- Last updated: September 27, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Evidence is too thin for a benchmark verdict: Grok Code Fast 1 and Qwen3.5 Flash 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.
- Qwen3.5 Flash has the lower published output-token price.
- Qwen3.5 Flash has the larger published context window at 1M.

## Model Snapshot

| Property | Grok Code Fast 1 | Qwen3.5 Flash |
|----------|----------|----------|
| Creator | xAI | Alibaba |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 256K | 1M |
| Independent public score (not head-to-head) | 32.05 | 45.49 |
| Benchmarks Covered | 2 | 6 |
| Pricing (input/output) | $0.20 / $1.50 | $0.10 / $0.40 |

## Category Breakdown

### Coding

- Winner: Insufficient shared evidence
- Grok Code Fast 1 public-lane score: 21.8 (Estimated · #112/135)
- Qwen3.5 Flash public-lane score: 26.5 (Estimated · #97/135)

| Benchmark | Grok Code Fast 1 | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 70.8% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 62.0% | 83.3% | Qwen3.5 Flash |
| SWE-bench (Vals) | Coming soon | 64.4% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Grok Code Fast 1 public-lane score: 58.5 (Unranked · 2 rankable rows)
- Qwen3.5 Flash public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- Grok Code Fast 1 public-lane score: 35.9 (Estimated · #104/158)
- Qwen3.5 Flash public-lane score: 43 (Estimated · #80/158)

| Benchmark | Grok Code Fast 1 | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | Coming soon | 82.8% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 84.1% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Grok Code Fast 1 public-lane score: 46.8 (#87/124)
- Qwen3.5 Flash public-lane score: Coming soon

### Mathematics

- Winner: Insufficient shared evidence
- Grok Code Fast 1 public-lane score: Coming soon
- Qwen3.5 Flash public-lane score: 28.4 (Unranked · 2 rankable rows)

| Benchmark | Grok Code Fast 1 | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | Coming soon | 6.207% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 0.000% | Coming soon |

## FAQ

### Is there enough evidence to pick between Grok Code Fast 1 and Qwen3.5 Flash?

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

- [Grok Code Fast 1 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-code-fast-1)
- [Qwen3.5 Flash vs GPT-6 Astra](/compare/gpt-6-astra-vs-qwen3-5-flash)
- [Grok Code Fast 1 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-grok-code-fast-1)
- [Qwen3.5 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-qwen3-5-flash)

## Explore More

- [Grok Code Fast 1 profile](/models/grok-code-fast-1)
- [Qwen3.5 Flash profile](/models/qwen3-5-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)