OpenAI: GPT-5.6 Luna (batch) vs StepFun: Step 3.7 Flash
Based on weekly OpenRouter usage tracked by AI Tier List, OpenAI: GPT-5.6 Luna (batch) ranks #3 overall — ahead of StepFun: Step 3.7 Flash at #14. OpenAI: GPT-5.6 Luna (batch) is cheaper on input tokens at $0.10/1M vs $0.20/1M for StepFun: Step 3.7 Flash. OpenAI: GPT-5.6 Luna (batch) offers the larger context window at 1.1M tokens.
OpenAI: GPT-5.6 Luna (batch) vs StepFun: Step 3.7 Flash: which should you use?
Choose OpenAI: GPT-5.6 Luna (batch) if…
- It sees more real traffic — #3 overall on OpenRouter's weekly ranking, against #14 for StepFun: Step 3.7 Flash.
- Cheaper to read — $0.10 vs $0.20 per 1M input tokens, which is what dominates long-prompt and RAG workloads.
- Cheaper to write — $0.60 vs $1.15 per 1M output tokens, the line item that decides generation-heavy costs.
- Bigger context window — 1.1M vs 262K tokens.
- It accepts file input, which StepFun: Step 3.7 Flash does not.
- It is the newer model — released Jul 2026 against May 2026.
Choose StepFun: Step 3.7 Flash if…
- It accepts video input, which OpenAI: GPT-5.6 Luna (batch) does not.
Spec Comparison
| Spec | OpenAI: GPT-5.6 Luna (batch) | StepFun: Step 3.7 Flash |
|---|---|---|
| Author | openai | stepfun |
| Input price (per 1M tokens) | $0.10 | $0.20 |
| Output price (per 1M tokens) | $0.60 | $1.15 |
| Context window | 1.1M | 262K |
| Input modalities | file, image, text | text, image, video |
| Output modalities | text | text |
| AA Intelligence | — | 30.9 |
| AA Coding | — | 39.6 |
| AA Agentic | — | 21.7 |
| Released | Jul 2026 | May 2026 |
What OpenAI: GPT-5.6 Luna (batch) and StepFun: Step 3.7 Flash actually cost to run
On a read-heavy job — 1M tokens in, 100K out — OpenAI: GPT-5.6 Luna (batch) costs $0.16 and StepFun: Step 3.7 Flash costs $0.32.
Flip the shape — 100K in, 1M out — and it becomes $0.61 for OpenAI: GPT-5.6 Luna (batch) versus $1.17 for StepFun: Step 3.7 Flash.
Both figures are the published per-token rates multiplied out; caching and batch discounts are not included.
Usage Rank by Task
| Task | OpenAI: GPT-5.6 Luna (batch) | StepFun: Step 3.7 Flash |
|---|---|---|
| Overall | #3 | #14 |
| Memory Extraction | — | #5 |
| Multi-step Planning | #6 | — |
| Tool Dispatch | #4 | #8 |
| Web Search | #9 | — |
| Agent Workflows | #7 | #8 |
| Classification & Tagging | #3 | — |
| Debugging | #7 | #9 |
| DevOps Config | #6 | #9 |
| File Read/Write | #6 | #8 |
| Frontend UI | #5 | #8 |
| Code Implementation | #5 | #10 |
| Repo Analysis | #5 | #9 |
| Code Review & Security | #5 | #10 |
| Shell Execution | — | #8 |
About OpenAI: GPT-5.6 Luna (batch) and StepFun: Step 3.7 Flash
OpenAI: GPT-5.6 Luna (batch)
Built by openai · released Jul 2026 · 1.1M-token context
GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for...
StepFun: Step 3.7 Flash
Built by stepfun · released May 2026 · 262K-token context
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...
Related comparisons
- OpenAI: GPT-5.6 Luna (batch) vs DeepSeek: DeepSeek V4 Flash 0731
- OpenAI: GPT-5.6 Luna (batch) vs Tencent: Hy3
- OpenAI: GPT-5.6 Luna (batch) vs DeepSeek: DeepSeek V4 Flash 0423
- StepFun: Step 3.7 Flash vs DeepSeek: DeepSeek V4 Flash 0731
- StepFun: Step 3.7 Flash vs Tencent: Hy3
- StepFun: Step 3.7 Flash vs DeepSeek: DeepSeek V4 Flash 0423
Get notified when OpenAI: GPT-5.6 Luna (batch) or StepFun: Step 3.7 Flash moves
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FAQ
Which is better, OpenAI: GPT-5.6 Luna (batch) or StepFun: Step 3.7 Flash?
Based on weekly OpenRouter usage tracked by AI Tier List, OpenAI: GPT-5.6 Luna (batch) ranks #3 overall — ahead of StepFun: Step 3.7 Flash at #14. OpenAI: GPT-5.6 Luna (batch) is cheaper on input tokens at $0.10/1M vs $0.20/1M for StepFun: Step 3.7 Flash. OpenAI: GPT-5.6 Luna (batch) offers the larger context window at 1.1M tokens.
Which is cheaper, OpenAI: GPT-5.6 Luna (batch) or StepFun: Step 3.7 Flash?
OpenAI: GPT-5.6 Luna (batch) is cheaper at $0.10 per 1M input tokens. Output pricing: OpenAI: GPT-5.6 Luna (batch) $0.60, StepFun: Step 3.7 Flash $1.15.
Which is better for coding, OpenAI: GPT-5.6 Luna (batch) or StepFun: Step 3.7 Flash?
OpenAI: GPT-5.6 Luna (batch). Best coding-task usage rank this week: OpenAI: GPT-5.6 Luna (batch) #5, StepFun: Step 3.7 Flash #8.
Is OpenAI: GPT-5.6 Luna (batch) still ahead of StepFun: Step 3.7 Flash right now?
Yes. For the week of 2026-08-10, OpenAI: GPT-5.6 Luna (batch) ranks #3 overall on OpenRouter usage against #14 for StepFun: Step 3.7 Flash. Ranks refresh weekly, and the verdict on this page flips if they cross.
Usage ranks are weekly data aggregated by OpenRouter. Prices are USD per 1M tokens.