Claude 1M Context Window Now GA: No Long-Context Premium, 78.3% MRCR v2, Rolling Out to CoWork

Anthropic·high signal

Anthropic confirmed general availability of the 1M context window for Opus 4.6 and Sonnet 4.6 at standard pricing — no multiplier, a 900K-token request billed at the same rate as a 9K one. Opus 4.6 scores 78.3% on MRCR v2 (highest among frontier models at that length), and media handling expanded 6x to 600 images or PDF pages per request. The r/ClaudeAI community flagged that Claude CoWork also received the 1M context upgrade (197up), making it practical for loading entire codebases or full multi-day agent traces.