AI Models · Open-Source vs Open-Source

Step 3.7 Flash Open vs Mistral Medium 3.5 Open

Step 3.7 Flash vs Mistral Medium 3.5 compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.

Prices & specs refreshed from live data · olud.ai

Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.

Choose Step 3.7 Flash for the lower output price ($1.15/M vs $7.5/M). It also gives you the larger 262K context window.

Step 3.7 Flash vs Mistral Medium 3.5 specs

SpecStep 3.7 FlashMistral Medium 3.5
MakerStepfunMistral AI
TypeOpen-weightOpen-weight
Context window262K tokens262K tokens
Input price$0.2/M · free self-host$1.5/M · free self-host
Output price$1.15/M · free self-host$7.5/M · free self-host
Vision / multimodalYesYes
Tool / function callingYesYes
Self-hostableYesYes
LicenseOpen weightsApache 2.0

Feature comparison

CapabilityStep 3.7 FlashMistral Medium 3.5
Open weights (downloadable)✓✓
Self-hostable✓✓
Runs fully offline✓✓
Vision / multimodal✓✓
Tool / function calling✓✓
1M+ context window✗✗

Benchmarks: Step 3.7 Flash vs Mistral Medium 3.5

Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).

Step 3.7 Flash delivers 6.9× more intelligence per dollar.
Step 3.7 Flash
Mistral Medium 3.5
Intelligence index
30.3
29.9
Coding index
39.6
46.9
GPQA
80.9%
74.8%
Humanity's Last Exam
19.9%
12.8%
Long Context Reasoning
63.7%
61%
SciCode
40%
39.6%
IFBench
67.3%
68.8%
τ²-Bench
98.5%
94.2%
τ-Bench Banking
11.3%
14.4%
Terminal-Bench
39.3%
50.6%
Terminal-Bench Hard
35.6%
33.3%
Speed
403.2 tok/s
59.8 tok/s
Latency
0.74s
0.77s
Intelligence per $
69.2
10

Benchmark data by Artificial Analysis.

How Step 3.7 Flash and Mistral Medium 3.5 score

🤝 Neck and neck on these criteria (4.7 vs 4.6 / 5).
CriterionStep 3.7 FlashMistral Medium 3.5
Cost-efficiency4.54.0
Context window4.04.0
Openness5.05.0
Self-hosting5.05.0
Multimodality5.05.0

Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.

What each model is

Step 3.7 Flash Open

Stepfun · Open-weight

Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision encoder for native image and video understanding, activating roughly 11B parameters...

Mistral Medium 3.5 Open

Mistral AI · Open-weight

Mistral Medium 3.5 is a dense 128B instruction-following model from Mistral AI. It supports text and image inputs with text output, and is designed for agentic workflows, coding, and complex...

Other models in these families

These variants are tracked but not compared here — one page per family keeps the comparison readable.

Other variants tracked
Step 3.5 Flash
Other variants tracked
Mistral Small 4Devstral 2 2512Mistral Large 3 2512Mistral Medium 3.1Mistral Small 3.1 24BMistral Medium 3Ministral 3 14B 2512Mistral Small 3.2 24BMinistral 3 8B 2512Mistral LargeMistral Large 2407Mistral Small 3SabaMinistral 3 3B 2512Mixtral 8x22B InstructCodestral 2508UncensoredVoxtral Small 24B 2507Mistral Nemo

Frequently asked questions

Step 3.7 Flash vs Mistral Medium 3.5 — which is cheaper?

Step 3.7 Flash is cheaper on output ($1.15/M vs $7.5/M).

Which has the larger context window?

Step 3.7 Flash offers the larger context window (262K tokens).

Step 3.7 Flash vs Mistral Medium 3.5 — which should I pick in 2026?

Choose Step 3.7 Flash for the lower output price ($1.15/M vs $7.5/M). It also gives you the larger 262K context window.

People also compare

MiMo-V2.5-Pro vs Mistral Medium 3.5DeepSeek V4 Pro vs Mistral Medium 3.5Hy3 vs Mistral Medium 3.5GLM 5.2 vs Mistral Medium 3.5Nemotron 3 Ultra vs Mistral Medium 3.5MiniMax M3 vs Mistral Medium 3.5

Explore more open-source AI

Browse the full open-source model leaderboard, thousands of tools and live benchmarks — all in one place.

Open the leaderboard →