OpenAI: GPT-5.5 (batch) vs OpenAI: GPT-5.6 Luna (batch)
Based on weekly OpenRouter usage tracked by AI Tier List, OpenAI: GPT-5.6 Luna (batch) ranks #3 overall — ahead of OpenAI: GPT-5.5 (batch) at #39. OpenAI: GPT-5.6 Luna (batch) is cheaper on input tokens at $0.10/1M vs $2.50/1M for OpenAI: GPT-5.5 (batch).
OpenAI: GPT-5.5 (batch) vs OpenAI: GPT-5.6 Luna (batch): which should you use?
Choose OpenAI: GPT-5.5 (batch) if…
On every published figure — price, context, benchmarks — it does not come out ahead of OpenAI: GPT-5.6 Luna (batch).
Choose OpenAI: GPT-5.6 Luna (batch) if…
- It sees more real traffic — #3 overall on OpenRouter's weekly ranking, against #39 for OpenAI: GPT-5.5 (batch).
- Cheaper to read — $0.10 vs $2.50 per 1M input tokens, which is what dominates long-prompt and RAG workloads.
- Cheaper to write — $0.60 vs $15 per 1M output tokens, the line item that decides generation-heavy costs.
- It is the newer model — released Jul 2026 against Apr 2026.
Spec Comparison
| Spec | OpenAI: GPT-5.5 (batch) | OpenAI: GPT-5.6 Luna (batch) |
|---|---|---|
| Author | openai | openai |
| Input price (per 1M tokens) | $2.50 | $0.10 |
| Output price (per 1M tokens) | $15 | $0.60 |
| Context window | 1.1M | 1.1M |
| Input modalities | file, image, text | file, image, text |
| Output modalities | text | text |
| AA Intelligence | — | — |
| AA Coding | — | — |
| AA Agentic | — | — |
| Released | Apr 2026 | Jul 2026 |
What OpenAI: GPT-5.5 (batch) and OpenAI: GPT-5.6 Luna (batch) actually cost to run
On a read-heavy job — 1M tokens in, 100K out — OpenAI: GPT-5.5 (batch) costs $4.00 and OpenAI: GPT-5.6 Luna (batch) costs $0.16.
Flip the shape — 100K in, 1M out — and it becomes $15 for OpenAI: GPT-5.5 (batch) versus $0.61 for OpenAI: GPT-5.6 Luna (batch).
Both figures are the published per-token rates multiplied out; caching and batch discounts are not included.
Usage Rank by Task
| Task | OpenAI: GPT-5.5 (batch) | OpenAI: GPT-5.6 Luna (batch) |
|---|---|---|
| Overall | #39 | #3 |
| Multi-step Planning | — | #6 |
| Tool Dispatch | — | #4 |
| Web Search | — | #9 |
| Agent Workflows | — | #7 |
| Classification & Tagging | — | #3 |
| Debugging | — | #7 |
| DevOps Config | — | #6 |
| File Read/Write | — | #6 |
| Frontend UI | — | #5 |
| Code Implementation | — | #5 |
| Repo Analysis | — | #5 |
| Code Review & Security | — | #5 |
| SQL & Database | — | #5 |
| Content Writing | — | #8 |
About OpenAI: GPT-5.5 (batch) and OpenAI: GPT-5.6 Luna (batch)
OpenAI: GPT-5.5 (batch)
Built by openai · released Apr 2026 · 1.1M-token context
GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...
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...
Related comparisons
- OpenAI: GPT-5.5 (batch) vs DeepSeek: DeepSeek V4 Flash 0731
- OpenAI: GPT-5.5 (batch) vs Tencent: Hy3
- OpenAI: GPT-5.5 (batch) vs DeepSeek: DeepSeek V4 Flash 0423
- 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
Get notified when OpenAI: GPT-5.5 (batch) or OpenAI: GPT-5.6 Luna (batch) moves
Usage ranks and prices refresh weekly. We email you when they move — once a week, no spam.
FAQ
Which is better, OpenAI: GPT-5.5 (batch) or OpenAI: GPT-5.6 Luna (batch)?
Based on weekly OpenRouter usage tracked by AI Tier List, OpenAI: GPT-5.6 Luna (batch) ranks #3 overall — ahead of OpenAI: GPT-5.5 (batch) at #39. OpenAI: GPT-5.6 Luna (batch) is cheaper on input tokens at $0.10/1M vs $2.50/1M for OpenAI: GPT-5.5 (batch).
Which is cheaper, OpenAI: GPT-5.5 (batch) or OpenAI: GPT-5.6 Luna (batch)?
OpenAI: GPT-5.6 Luna (batch) is cheaper at $0.10 per 1M input tokens. Output pricing: OpenAI: GPT-5.5 (batch) $15, OpenAI: GPT-5.6 Luna (batch) $0.60.
Is OpenAI: GPT-5.6 Luna (batch) still ahead of OpenAI: GPT-5.5 (batch) right now?
Yes. For the week of 2026-08-10, OpenAI: GPT-5.6 Luna (batch) ranks #3 overall on OpenRouter usage against #39 for OpenAI: GPT-5.5 (batch). 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.