OpenAI: GPT-5.6 Luna (batch) vs SpaceXAI: Grok 4.5
Based on weekly OpenRouter usage tracked by AI Tier List, OpenAI: GPT-5.6 Luna (batch) ranks #3 overall — ahead of SpaceXAI: Grok 4.5 at #31. OpenAI: GPT-5.6 Luna (batch) is cheaper on input tokens at $0.10/1M vs $2/1M for SpaceXAI: Grok 4.5. OpenAI: GPT-5.6 Luna (batch) offers the larger context window at 1.1M tokens.
OpenAI: GPT-5.6 Luna (batch) vs SpaceXAI: Grok 4.5: 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 #31 for SpaceXAI: Grok 4.5.
- Cheaper to read — $0.10 vs $2 per 1M input tokens, which is what dominates long-prompt and RAG workloads.
- Cheaper to write — $0.60 vs $6 per 1M output tokens, the line item that decides generation-heavy costs.
- Bigger context window — 1.1M vs 500K tokens.
- It is the newer model — released Jul 2026 against Jul 2026.
Choose SpaceXAI: Grok 4.5 if…
On every published figure — price, context, benchmarks — it does not come out ahead of OpenAI: GPT-5.6 Luna (batch).
Spec Comparison
| Spec | OpenAI: GPT-5.6 Luna (batch) | SpaceXAI: Grok 4.5 |
|---|---|---|
| Author | openai | x-ai |
| Input price (per 1M tokens) | $0.10 | $2 |
| Output price (per 1M tokens) | $0.60 | $6 |
| Context window | 1.1M | 500K |
| Input modalities | file, image, text | text, image, file |
| Output modalities | text | text |
| AA Intelligence | — | 55.8 |
| AA Coding | — | 72.4 |
| AA Agentic | — | 48.9 |
| Released | Jul 2026 | Jul 2026 |
What OpenAI: GPT-5.6 Luna (batch) and SpaceXAI: Grok 4.5 actually cost to run
On a read-heavy job — 1M tokens in, 100K out — OpenAI: GPT-5.6 Luna (batch) costs $0.16 and SpaceXAI: Grok 4.5 costs $2.60.
Flip the shape — 100K in, 1M out — and it becomes $0.61 for OpenAI: GPT-5.6 Luna (batch) versus $6.20 for SpaceXAI: Grok 4.5.
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) | SpaceXAI: Grok 4.5 |
|---|---|---|
| Overall | #3 | #31 |
| 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-5.6 Luna (batch) and SpaceXAI: Grok 4.5
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...
SpaceXAI: Grok 4.5
Built by x-ai · released Jul 2026 · 500K-token context
Grok 4.5 is a model from SpaceXAI with frontier performance on coding, knowledge work, and STEM.
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
- SpaceXAI: Grok 4.5 vs DeepSeek: DeepSeek V4 Flash 0731
- SpaceXAI: Grok 4.5 vs Tencent: Hy3
- SpaceXAI: Grok 4.5 vs DeepSeek: DeepSeek V4 Flash 0423
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FAQ
Which is better, OpenAI: GPT-5.6 Luna (batch) or SpaceXAI: Grok 4.5?
Based on weekly OpenRouter usage tracked by AI Tier List, OpenAI: GPT-5.6 Luna (batch) ranks #3 overall — ahead of SpaceXAI: Grok 4.5 at #31. OpenAI: GPT-5.6 Luna (batch) is cheaper on input tokens at $0.10/1M vs $2/1M for SpaceXAI: Grok 4.5. 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 SpaceXAI: Grok 4.5?
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, SpaceXAI: Grok 4.5 $6.
Is OpenAI: GPT-5.6 Luna (batch) still ahead of SpaceXAI: Grok 4.5 right now?
Yes. For the week of 2026-08-10, OpenAI: GPT-5.6 Luna (batch) ranks #3 overall on OpenRouter usage against #31 for SpaceXAI: Grok 4.5. 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.