ByteDance 7/13 Doubao 1.6 Pro: 256K context + tool-use refresh, full weights gated to Volcengine API

ByteDance Volcengine on 2026-07-13 publishes Doubao 1.6 Pro — 256K context, refreshed tool-use schema, post-training emphasizing document-extraction / retrieval-grounded tasks. Self-reported figures include MMLU-Pro 80.7, GPQA-Diamond 72.4, C-Eval 88.6, CMMLU 86.9, LiveCodeBench v6 70.3, Terminal-Bench 2.1 73.5. License: commercial-only via Volcengine API; full weights remain gated to API.