Overview
Analysis
Claude Opus 5.5 vs GPT-6 Astra vs DeepSeek V4 Pro 0813 vs Kimi K3: side-by-side summary
Claude Opus 5.5, GPT-6 Astra, DeepSeek V4 Pro 0813, and Kimi K3 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Claude Opus 5.5, from Anthropic, has a 1,000,000-token context window and is priced at $4/M tokens input, $20/M tokens output on OpenRouter.
GPT-6 Astra, from OpenAI, has a 1,050,000-token context window and is priced at $10/M tokens input, $50/M tokens output on OpenRouter.
DeepSeek V4 Pro 0813, from DeepSeek, has a 1,048,576-token context window and is priced at $0.1035/M tokens input, $8/M tokens output on OpenRouter.
Kimi K3, from moonshotai, has a 1,048,576-token context window and is priced at $0.1495/M tokens input, $7.15/M tokens output on OpenRouter.
| Attribute | Claude Opus 5.5 | GPT-6 Astra | DeepSeek V4 Pro 0813 | Kimi K3 |
|---|---|---|---|---|
| Context window | 1,000,000 tokens | 1,050,000 tokens | 1,048,576 tokens | 1,048,576 tokens |
| Price | $4/M tokens input, $20/M tokens output | $10/M tokens input, $50/M tokens output | $0.1035/M tokens input, $8/M tokens output | $0.1495/M tokens input, $7.15/M tokens output |
| Provided by | Anthropic | OpenAI | DeepSeek | moonshotai |
| Model page | Claude Opus 5.5 model details, providers and pricing | GPT-6 Astra model details, providers and pricing | DeepSeek V4 Pro 0813 model details, providers and pricing | Kimi K3 model details, providers and pricing |