1M Token Long Context Window

Anthropic Claude: 1M token context

Anthropic’s Claude model family supports expanding the context window from the default 200K tokens to 1,000,000 tokens (1M)—5× the default capacity.

Infron automatically enables the 1M token context window for Claude Sonnet 4/4.5/4.6 models. No configuration is required.

• Learn more: Announcement, Context windows docs

• Pricing: Requests that exceed 200K tokens are charged at premium rates. See pricing details.

With Infron, you can enable this capability effortlessly to handle large-scale document analysis, code review, long-running conversations, and more.

Supported Models

The following Claude models currently support the 1M-token context window:

Model	Default Context Window	Extended Context Window
Claude Opus 4.6	200K tokens	1M tokens
Claude Sonnet 4.5	200K tokens	1M tokens
Claude Sonnet 4	200K tokens	1M tokens

The 1M-token context window is currently a Beta feature, and functionality and pricing may change in future versions.

Long-Context Pricing

When the number of tokens in a request exceeds 200K, long-context pricing will apply automatically. The multipliers are as follows:

Pricing Item	Up to 200K	Over 200K
Input tokens	1x (standard rate)	2x (double rate)
Output tokens	1x (standard rate)	1.5x (1.5× standard rate)