ByteDance Seed 2.1 Turbo: GPT-5.5-Class Agents at $0.41 per Million Tokens

In one line: ByteDance released Seed 2.1 Turbo on August 12 — a cost-optimized variant of Seed 2.1 that trades 3–5 percentage points on benchmarks for a 60–75% cost reduction and 40–60% latency improvement.

Key points

• Pricing: $0.41 input / $2.07 output per million tokens via Volcano Engine — lowest at this capability tier
• Performance: Company-reported parity with GPT-5.5 on agentic coding and long-horizon task execution
• Trade-off vs Pro: ~3–5pp benchmark drop in exchange for dramatically lower cost and faster inference
• Context window: 262K tokens; supports multi-turn conversation, tool use, JSON mode, and streaming
• Internal name: Doubao-Seed-2.1-Turbo — powering ByteDance's flagship Doubao AI app

Why it matters

Cost is the primary barrier to scaling agentic AI in production. Seed 2.1 Turbo's price point makes GPT-5.5-level capability accessible for high-frequency agent pipelines that would be cost-prohibitive at premium model rates. The main caveat: benchmark claims are vendor-reported and independent third-party verification remains limited.

Read more

• Seed 2.1 Turbo — Pricing, Providers & Benchmarks — LLM Gateway
• ByteDance Seed: Seed 2.1 Turbo Review — Design for Online