Solar Pro 4 vs Step 3.7 Flash
Solar Pro 4 and Step 3.7 Flash are closely matched at 35.2 and 30.2 on the LLM Stats Score. Step 3.7 Flash is 1.2x cheaper per token.
Upstage · StepFun · Updated for 2026
Which is better?
Solar Pro 4 and Step 3.7 Flash are closely matched on the overall LLM Stats Score at 35.2 and 30.2.
In the 1 individual benchmarks reported for both models, Step 3.7 Flash wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Step 3.7 Flash is roughly 1.2x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Solar Pro 4 also accepts a larger context window (524,288 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Solar Pro 4
- you process long inputs — it offers a 524,288 token context window
- you want the most recent training data — it shipped Aug 2026
Choose Step 3.7 Flash
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- cost matters — it's about 1.2x cheaper per token
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Individual benchmarks
9 reported for Solar Pro 4 · 4 for Step 3.7 Flash
Solar Pro 4 outperforms in 0 benchmarks, while Step 3.7 Flash is better at 1 benchmark (Terminal-Bench 2.1).
Step 3.7 Flash significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Solar Pro 4 ($0.30/1M tokens) is 1.5x more expensive than Step 3.7 Flash ($0.20/1M tokens).
For output processing, Solar Pro 4 ($1.20/1M tokens) is 1.0x more expensive than Step 3.7 Flash ($1.15/1M tokens).
In conclusion, Solar Pro 4 is more expensive than Step 3.7 Flash.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Solar Pro 4 accepts 524,288 input tokens compared to Step 3.7 Flash's 262,144 tokens. Step 3.7 Flash can generate longer responses up to 262,144 tokens, while Solar Pro 4 is limited to 131,072 tokens.
Input capabilities
Documented input modalities across available providers
Step 3.7 Flash supports multimodal inputs, whereas Solar Pro 4 does not.
Step 3.7 Flash can handle both text and other forms of data like images, making it suitable for multimodal applications.
Solar Pro 4
Step 3.7 Flash
License
Usage and distribution terms
Solar Pro 4 is licensed under a proprietary license, while Step 3.7 Flash uses Apache 2.0.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Apache 2.0
Open weights
Release Timeline
When each model was launched
Solar Pro 4 was released on 2026-08-06, while Step 3.7 Flash was released on 2026-06-10.
Solar Pro 4 is 2 months newer than Step 3.7 Flash.
Aug 6, 2026
1 months ago
1mo newerJun 10, 2026
3 months ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Solar Pro 4 is available from Upstage. Step 3.7 Flash is available from DeepInfra.
Solar Pro 4
Step 3.7 Flash
Outputs Comparison
Judge for yourself.
Run your own prompts against Solar Pro 4 and Step 3.7 Flash side-by-side, then vote on the output you prefer.
FAQ
Common questions about Solar Pro 4 vs Step 3.7 Flash.