#context-windows

A dark comparison-matrix style cover reading GPT-5.6's Context Window, 922K input and 128K output tokens on o200k_base, listing three row summaries: old context window 128K to 200K tokens, new context window about 1.05M tokens, and this site's token counter not yet supporting o200k_base

AI Productivity

GPT-5.6's Context Window: 922K In, 128K Out Tokens

GPT-5.6 shipped a ~1.05M-token context window (922K input, 128K output) on the o200k_base encoding. What changes for existing integrations.

Aug 12, 2026Read more →