GPT-5.6 Luna Pro is 21.4× cheaper per million tokens (blended). GPT-5.6 Luna Pro has the larger context window (1,050,000 vs 1,000,000 tokens).
Claude Opus 5 vs GPT-5.6 Luna Pro
Live catalog fields. Best-in-row is highlighted.
Claude Opus 5
Anthropic · anthropic__claude-opus-5
GPT-5.6 Luna Pro
OpenAI · openai__gpt-5.6-luna-pro
Identity
| Field | anthropic__claude-opus-5 | openai__gpt-5.6-luna-pro |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Slug | anthropic__claude-opus-5 | openai__gpt-5.6-luna-pro |
| Status | live | live |
| Open weights | No | No |
| License | — | — |
| HuggingFace | — | — |
Quality
| Field | anthropic__claude-opus-5 | openai__gpt-5.6-luna-pro |
|---|---|---|
| Quality index (0–100) | — | — |
Cost
| Field | anthropic__claude-opus-5 | openai__gpt-5.6-luna-pro |
|---|---|---|
| Input $ / 1M tokens | $5.00 | $0.20 |
| Cached input $ / 1M | $0.50 | $0.02 |
| Output $ / 1M tokens | $25.00 | $1.20 |
Context
| Field | anthropic__claude-opus-5 | openai__gpt-5.6-luna-pro |
|---|---|---|
| Max context tokens | 1,000,000 | 1,050,000 |
| Max output tokens | 128,000 | 128,000 |
Modalities
| Field | anthropic__claude-opus-5 | openai__gpt-5.6-luna-pro |
|---|---|---|
| Input | text, image, file | file, image, text |
| Output | text | text |