Step 3.7 Flash Open vs 
Claude Haiku 4.5 Paid
Step 3.7 Flash vs Claude Haiku 4.5 compared — price per token, context window, multimodality, openness and which to choose. Can the open-source model replace the paid one? Full 2026 breakdown.
Claude Haiku 4.5 — full profile ›
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
Step 3.7 Flash vs Claude Haiku 4.5 specs
| Spec | Step 3.7 Flash | Claude Haiku 4.5 |
|---|---|---|
| Maker | Stepfun | Anthropic |
| Type | Open-weight | Proprietary |
| Context window | 262K tokens | 200K tokens |
| Input price | $0.2/M · free self-host | $1/M |
| Output price | $1.15/M · free self-host | $5/M |
| Vision / multimodal | Yes | Yes |
| Tool / function calling | Yes | Yes |
| Self-hostable | Yes | No (API only) |
| License | Open weights | Proprietary |
Feature comparison
| Capability | Step 3.7 Flash | Claude Haiku 4.5 |
|---|---|---|
| Open weights (downloadable) | ✓ | ✗ |
| Self-hostable | ✓ | ✗ |
| Runs fully offline | ✓ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✗ | ✗ |
Benchmarks: Step 3.7 Flash vs Claude Haiku 4.5
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How Step 3.7 Flash and Claude Haiku 4.5 score
| Criterion | Step 3.7 Flash | Claude Haiku 4.5 |
|---|---|---|
| Cost-efficiency | 4.5 | 4.0 |
| Context window | 4.0 | 4.0 |
| Openness | 5.0 | 1.5 |
| Self-hosting | 5.0 | 1.0 |
| Multimodality | 5.0 | 5.0 |
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
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...
Claude Haiku 4.5 Paid
Claude Haiku 4.5 is Anthropic’s fastest and most efficient model, delivering near-frontier intelligence at a fraction of the cost and latency of larger Claude models. Matching Claude Sonnet 4’s performance...
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 Claude Haiku 4.5?
Step 3.7 Flash is open-weight and competitive on many tasks, but Claude Haiku 4.5 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. Claude Haiku 4.5 is API-only and cannot be self-hosted.
How much cheaper is Step 3.7 Flash?
Step 3.7 Flash costs $1.15/M output vs $5/M for Claude Haiku 4.5 — roughly 4x cheaper via API, and free if you self-host.
Step 3.7 Flash vs Claude Haiku 4.5 — 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 Claude Haiku 4.5 if you want frontier capability through a managed API with zero infrastructure to run.
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