Step 3.7 Flash Open vs INMercury 2.5 Paid
Step 3.7 Flash vs Mercury 2.5 compared — price per token, context window, multimodality, openness and which to choose. Can the open-source model replace the paid one? Full 2026 breakdown.
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
$1.15 /M outputNo per-token fees if you self-host
$0.15 /M outputManaged API (no infra to run)
Step 3.7 Flash vs Mercury 2.5 specs
| Spec | Step 3.7 Flash | Mercury 2.5 | Winner |
|---|---|---|---|
| Maker | Stepfun | Inception | – |
| Type | Open-weight | Proprietary | |
| Context window | 262K tokens | 260K tokens | |
| Input price | $0.2/M · free self-host | $0.04/M | INMercury 2.5 |
| Output price | $1.15/M · free self-host | $0.15/M | INMercury 2.5 |
| Vision / multimodal | Yes | No | |
| Tool / function calling | Yes | Yes | = Tie |
| Self-hostable | Yes | No (API only) | |
| License | Open weights | Proprietary |
Price gap & when to choose each
Mercury 2.5 is ~7.7× cheaper than Step 3.7 Flash on output tokens ($0.15 vs $1.15 per M tokens).
- You want to self-host or run on your cloud
- You need the longer 262K context window
- You prioritize data privacy & control
- You are building open or reproducible AI
- You want frontier performance through a managed API
- You want the lower output price
- You value reliability & ecosystem
- You don't want to manage infrastructure
Feature comparison
| Capability | Step 3.7 Flash | Mercury 2.5 |
|---|---|---|
| Open weights (downloadable) | ✓ | ✗ |
| Self-hostable | ✓ | ✗ |
| Runs fully offline | ✓ | ✗ |
| Vision / multimodal | ✓ | ✗ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✗ | ✗ |
Benchmarks: Step 3.7 Flash vs Mercury 2.5
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How Step 3.7 Flash and Mercury 2.5 score
| Criterion | Step 3.7 Flash | Mercury 2.5 |
|---|---|---|
| Cost-efficiency | 4.5 | 5.0 |
| Context window | 4.0 | 4.0 |
| Openness | 5.0 | 1.5 |
| Self-hosting | 5.0 | 1.0 |
| Multimodality | 5.0 | 3.5 |
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
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...
Mercury 2.5 Paid
Mercury 2.5 is the fastest reasoning LLM, and the latest diffusion LLM (dLLM) from Inception. Instead of generating tokens sequentially, Mercury 2.5 produces and refines multiple tokens in parallel, achieving...
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
Is Step 3.7 Flash as good as Mercury 2.5?
Step 3.7 Flash is open-weight and competitive on many tasks, but Mercury 2.5 may still lead on the hardest reasoning and agentic work. The gap keeps narrowing — benchmark both on your actual use case before deciding.
Can I run Step 3.7 Flash locally?
Yes. Step 3.7 Flash has open weights, so you can self-host it on your own GPUs or run it via a low-cost API. Mercury 2.5 is API-only and cannot be self-hosted.
Step 3.7 Flash vs Mercury 2.5 — which should I pick in 2026?
Choose Step 3.7 Flash if you want to self-host, keep your data private and skip per-token fees — it's open-weight and runs on your own hardware. Choose Mercury 2.5 if you want frontier capability through a managed API with zero infrastructure to run.
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