# GPT-6.1 Sol vs Step 3.5 Flash

> Step 3.5 Flash has enough public results to be ranked (#116); GPT-6.1 Sol does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/gpt-6-1-sol-vs-step-3-5-flash
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-6.1 Sol leads 51.4 to 41.7.
- Step 3.5 Flash is cheaper at $0.10 / $0.30 per million input/output tokens, against $2 / $10 for GPT-6.1 Sol.
- GPT-6.1 Sol accepts more context: 1.05M tokens versus 256K.
- Step 3.5 Flash has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-6.1 Sol | Step 3.5 Flash |
|---|---|---|
| Provider | OpenAI | StepFun |
| Noometry Index | 42.1 | 41.7 |
| Rank | — | 116 |
| Context | 1.05M | 256K |
| Input $/M | $2 | $0.10 |
| Output $/M | $10 | $0.30 |
| Weights | Proprietary | Open |

## Coding

- GPT-6.1 Sol: 51.4
- Step 3.5 Flash: 41.7 (#106)

| Benchmark | GPT-6.1 Sol | Step 3.5 Flash |
|---|---|---|
| DeepSWE | 75.2% | — |
| LMArena Coding | — | 1436 |

## Agentic & Tool Use

- GPT-6.1 Sol: 34.3
- Step 3.5 Flash: —

| Benchmark | GPT-6.1 Sol | Step 3.5 Flash |
|---|---|---|
| GDP.pdf | 32% | — |

## Reasoning

- GPT-6.1 Sol: —
- Step 3.5 Flash: 21.2 (#202)

| Benchmark | GPT-6.1 Sol | Step 3.5 Flash |
|---|---|---|
| NYT Connections (extended) | — | 28.4% |
| LMArena Hard Prompts | — | 1411 |

## Math

- GPT-6.1 Sol: —
- Step 3.5 Flash: 40.6 (#77)

| Benchmark | GPT-6.1 Sol | Step 3.5 Flash |
|---|---|---|
| MathArena Final-Answer Competitions | — | 66.8% |
| LMArena Math | — | 1408 |

## Knowledge

- GPT-6.1 Sol: —
- Step 3.5 Flash: 39.0 (#127)

| Benchmark | GPT-6.1 Sol | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | — | 1422 |

## Multilingual

- GPT-6.1 Sol: —
- Step 3.5 Flash: 50.7 (#115)

| Benchmark | GPT-6.1 Sol | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | — | 1386 |
| LMArena Chinese | — | 1448 |
| LMArena French | — | 1421 |
| LMArena German | — | 1404 |
| LMArena Japanese | — | 1353 |
| LMArena Korean | — | 1350 |
| LMArena Russian | — | 1385 |
| LMArena Spanish | — | 1419 |

## Instruction Following

- GPT-6.1 Sol: —
- Step 3.5 Flash: 73.3 (#119)

| Benchmark | GPT-6.1 Sol | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | — | 1385 |

## Long Context

- GPT-6.1 Sol: —
- Step 3.5 Flash: 42.8 (#112)

| Benchmark | GPT-6.1 Sol | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | — | 1402 |

## Writing & Preference

- GPT-6.1 Sol: —
- Step 3.5 Flash: 59.0 (#108)

| Benchmark | GPT-6.1 Sol | Step 3.5 Flash |
|---|---|---|
| LMArena Text | — | 1403 |
| LMArena Creative Writing | — | 1357 |
| LMArena Multi-Turn | — | 1405 |

## FAQ

### Is GPT-6.1 Sol better than Step 3.5 Flash?

Step 3.5 Flash has enough public results to be ranked (#116); GPT-6.1 Sol does not yet, so treat this comparison as directional.

### Which is cheaper, GPT-6.1 Sol or Step 3.5 Flash?

Step 3.5 Flash is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; GPT-6.1 Sol lists at $2 and $10.

### Is GPT-6.1 Sol or Step 3.5 Flash better for coding?

GPT-6.1 Sol scores higher on coding benchmarks: 51.4 versus 41.7 in the Noometry coding category.

### Which has the bigger context window?

GPT-6.1 Sol does, with 1.05M tokens against 256K.

### How many benchmarks do GPT-6.1 Sol and Step 3.5 Flash share?

0 benchmarks have published results for both models. GPT-6.1 Sol has 2 scored results on Noometry and Step 3.5 Flash has 19.