ByteDance shipped two new flagship LLMs on June 24: Doubao Seed 2.1 Pro and a half-price Turbo twin. These aren’t chatbots in the consumer sense — they’re API models tuned for coding, long-horizon agent tasks, and multimodal work. The pitch is blunt: frontier capability, Chinese pricing.
What it actually does
Pro leads Terminal Bench 2.1, SWE-Pro, and SciCode on code, and tops OSWorld, MobileWorld, and MMMU-Pro on agent and multimodal benchmarks. It supports million-token context with a 51% jump in multi-step task completion over the last generation. On Code Arena’s frontend board it scored 1539 — tied with Opus 4.6. ByteDance also claims over 60% of developers rated its real coding output above Opus 4.6.
The API math
This is where it gets loud. Pro runs ¥6 per million input tokens, ¥30 output; Turbo halves that, and cached input drops to ¥1.2. Call it through Volcano Engine for agents, IDE copilots, or batch code generation.
Benchmark-leading numbers always need a grain of salt. The price isn’t a claim — it’s the weapon.
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