Claude 4.5 Opus
AI/ML API
Claude 4.5 Opus by AI/ML API costs $5.29 per 1M input tokens and $26.45 per 1M output tokens, with a 200K-token context window.
Pricing
Input (per 1M tokens)
$5.29
Output (per 1M tokens)
$26.45
Cached input (per 1M)
$0.53
Specifications
- Provider
- AI/ML API
- Context window
- 200K tokens
- Parameters
- —
- Released
- Nov 2025
- Open weights
- No
- Frontier model
- No
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FAQ
How much does Claude 4.5 Opus cost?
Claude 4.5 Opus is priced at $5.29 per 1M input tokens and $26.45 per 1M output tokens. Output tokens cost more than input.
What is Claude 4.5 Opus's context window?
Claude 4.5 Opus supports a context window of 200K tokens — the maximum prompt plus response length it can handle in a single request.
Is Claude 4.5 Opus open weight?
No — Claude 4.5 Opus is a closed/proprietary model accessed via API.
Data as of 2026-10-29. Source: models.dev (open). Pricing is per 1M tokens (USD); confirm with the provider before production use.