Compare / Mistral Small 3 vs Step 3.5 Flash
Mistral Small 3 vs Step 3.5 Flash
Which is cheaper, which is more capable, and which does better at each kind of work, from 15 results on 3 sources that measured both models.
Mistral Small 3 or Step 3.5 Flash? The short answer
- Mistral Small 3 is cheaper: $0.058 against $0.15 per million tokens, 2.6 times less.
- Step 3.5 Flash scores higher on the Artificial Analysis Intelligence Index: 16.6 against 6.7.
- On our business benchmarks, Mistral Small 3 ranks higher for sticking to the facts.
- On our business benchmarks, Step 3.5 Flash ranks higher for reasoning and knowledge and writing.
At a glance
| Mistral Small 3 | Step 3.5 Flash | |
|---|---|---|
| Price per million tokens | $0.050 in · $0.080 out | $0.10 in · $0.30 out |
| Blended (3 in : 1 out) | $0.058 | $0.15 |
| Cheapest host, blended | – | – |
| Intelligence Index | 6.7 | 16.6 |
| Spring Prompt overall | – | – |
| Output speed, tokens a second | – | – |
| Context window | 32,768 tokens | 262,144 tokens |
| Weights | Open | Open |
| Developer based in | France | China |
Prices are the developer's list price where we have read it, otherwise the typical host on OpenRouter; see every model's price. Intelligence and speed from Artificial Analysis.
Which is better for what
Each model's rank among models available today, for each kind of work, from our own benchmarks and licensed sources. The better rank is in green.
| Use case | Mistral Small 3 | Step 3.5 Flash |
|---|---|---|
| Reasoning and knowledgeHard questions across science, maths and general knowledge | 190 of 195 | 96 of 195 |
| WritingWhat people prefer in blind comparisons, and judged writing quality | 155 of 187 | 99 of 187 |
| Sticking to the factsSummarising without inventing things, and factual answers | 11 of 153 | 123 of 153 |
Every shared result
| Benchmark | Metric | Mistral Small 3 | Step 3.5 Flash |
|---|---|---|---|
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,259 | 1,390 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,227 | 1,345 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,259 | 1,429 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,255 | 1,384 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,274 | 1,393 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,248 | 1,366 |
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 6.70 | 16.6 |
| Artificial Analysisreported | GPQA Diamond% of questions | 46.2% | 83.1% |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 3.8% | 21.1% |
| Artificial Analysisreported | IFBench% of instructions | 26.4% | 64.6% |
| Artificial Analysisreported | Long-context reasoning (AA-LCR)% of questions | 0.0% | 50.0% |
| Artificial Analysisreported | Τ²-bench telecom% of tasks | 19.6% | 94.4% |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 8.0% | 42.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.35 | 0.37 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 33.9 | 45.9 |
Bold green marks the better value on that metric. Where a source reports ranges that overlap, the difference may not be meaningful; see the benchmark page for ranges.
Quick answers
Is Mistral Small 3 better than Step 3.5 Flash?
It depends on the task. Among models available today, on our benchmarks and licensed sources, Mistral Small 3 ranks higher for sticking to the facts; Step 3.5 Flash ranks higher for reasoning and knowledge and writing.
Which is cheaper, Mistral Small 3 or Step 3.5 Flash?
Mistral Small 3 costs $0.058 per million tokens (three input to one output), against $0.15 for Step 3.5 Flash.
Run Mistral Small 3 and Step 3.5 Flash on your own prompt
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