# Grok Code Fast 1 vs Step 3.5 Flash

> Side-by-side benchmark comparison for Grok Code Fast 1 and Step 3.5 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/grok-code-fast-1-vs-step-3-5-flash
- 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 Grok Code Fast 1 and Step 3.5 Flash.

## Summary

- Grok Code Fast 1 and Step 3.5 Flash 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 | Grok Code Fast 1 | Step 3.5 Flash |
|----------|----------|----------|
| Creator | xAI | StepFun |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 256K | 256K |
| Independent public score (not head-to-head) | 31.94 | 40.9 |
| Benchmarks Covered | 2 | 0 |
| Pricing (input/output) | $0.20 / $1.50 | $0.10 / $0.30 |

## Category Breakdown

### Coding

- Winner: Insufficient shared evidence
- Grok Code Fast 1 public-lane score: 21.5 (Estimated · #119/143)
- Step 3.5 Flash public-lane score: Coming soon

| Benchmark | Grok Code Fast 1 | Step 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 70.8% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 62.0% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Grok Code Fast 1 public-lane score: 58.7 (Unranked · 2 rankable rows)
- Step 3.5 Flash public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- Grok Code Fast 1 public-lane score: 36 (Estimated · #112/169)
- Step 3.5 Flash public-lane score: Coming soon

### Instruction Following

- Winner: Insufficient shared evidence
- Grok Code Fast 1 public-lane score: 46.8 (#87/124)
- Step 3.5 Flash public-lane score: Coming soon

## FAQ

### Can I compare Grok Code Fast 1 and Step 3.5 Flash 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

- [Grok Code Fast 1 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-code-fast-1)
- [Step 3.5 Flash vs GPT-6 Astra](/compare/gpt-6-astra-vs-step-3-5-flash)
- [Grok Code Fast 1 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-grok-code-fast-1)
- [Step 3.5 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-step-3-5-flash)

## Explore More

- [Grok Code Fast 1 profile](/models/grok-code-fast-1)
- [Step 3.5 Flash profile](/models/step-3-5-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)