TokenMix Research Lab · 2026-04-22
Doubao Seed 2.0 Code is ByteDance's coding-dedicated variant — fine-tuned for software engineering tasks on top of the Seed 2.0 base. It scores 87.8 LiveCodeBench v6 and 76.5 SWE-Bench Verified at roughly $0.30 input /
| Claim | Status |
|---|---|
| Seed 2.0 Code shipped Feb 14, 2026 with Seed family | Confirmed |
| 87.8 LiveCodeBench v6 | Confirmed (inherited from Seed 2.0 family) |
| 76.5 SWE-Bench Verified | Confirmed |
| Pricing ~$0.30 / .20 per MTok | Market rate, subject to confirmation |
| OpenAI-compatible API | Confirmed via Volcano Engine |
| Fine-tuned specifically for coding | Claimed by ByteDance |
| Beats Qwen3-Coder-Plus | Mixed — SWE-Bench comparable, on multi-lang Qwen ahead |
| Production-ready | Yes — used internally at ByteDance for dev workflows |
Three advantages of Code variant over Pro:
For pure text tasks (email drafting, creative writing), use Seed 2.0 Pro. For agent coding workflows, use Code.
| Benchmark | Seed 2.0 Code | Seed 2.0 Pro | GPT-5.4-Codex | Claude Opus 4.7 |
|---|---|---|---|---|
| HumanEval | ~94% | ~93% | 95% | 92% |
| LiveCodeBench v6 | 87.8 | 87.8 | ~85 | 88 |
| SWE-Bench Verified | 76.5% | 76.5% | ~70% | 87.6% |
| SWE-Bench Pro | ~58% (est) | ~55% | ~60% | 54% |
| Tool calling (BFCL) | Strong | Strong | Strong | Strong |
| Fill-in-the-middle | Strong | Good | Strong | Good |
| Multi-file refactor | Good | Fair | Good | Strong |
Key insight: Seed 2.0 Code matches Pro on benchmarks (same base) but delivers at 35% lower cost with coding-optimized latency.
| Model | Input $/MTok | Output $/MTok | Blended (80/20) | Quality (SWE-Bench Verified) |
|---|---|---|---|---|
| DeepSeek V3.2 | $0.14 | $0.28 | $0.17 | ~72% |
| Seed 2.0 Code | $0.30 | .20 | $0.48 | 76.5% |
| GLM-5.1 | $0.45 | .80 | $0.72 | ~78% |
| Qwen3-Coder-Plus | $0.40 | .60 | $0.64 | ~75-80% |
| GPT-5.4-Codex | $2.50 | 5.00 | $5.00 | ~70% |
| Claude Opus 4.7 | $5.00 | $25.00 | $9.00 | 87.6% |
Seed 2.0 Code hits an attractive point: 3× cheaper than Qwen3-Coder-Plus, similar quality, and 18× cheaper than Claude Opus 4.7 at ~88% of its SWE-Bench performance.
Tested integrations as of April 2026:
| Framework | Seed 2.0 Code | Notes |
|---|---|---|
| Cline (VS Code) | Via OpenAI endpoint | Popular |
| Aider | Works | --model volcengine/doubao-seed-2.0-code |
| OpenCode | Works | Terminal agent |
| Continue.dev | Works | VS Code |
| Cursor | Via OpenAI provider | Composer 2 is Cursor default |
| Claude Code | Not compatible | Anthropic-only |
For Chinese developer teams, Volcano Engine's native integration is smoother than going through Western gateways. International teams: use TokenMix.ai for consistent OpenAI-compatible access.
Three Chinese coding flagships head-to-head:
| Dimension | Seed 2.0 Code | Qwen3-Coder-Plus | GLM-5.1 |
|---|---|---|---|
| Input $/MTok | $0.30 | $0.40 | $0.45 |
| SWE-Bench Verified | 76.5% | ~75-80% | ~78% |
| SWE-Bench Pro | ~58% | ~62% | 70% |
| HumanEval | 94% | 92% | 92% |
| Context | 256K | 128K | 128K |
| Open weights | No | Yes | Yes (MIT) |
| Multi-lang support | Strong | 300+ langs | Strong |
| Agent tool use | Strong | Best | Strong |
Decision matrix:
Yes on benchmarks — Seed 2.0 Code scores 4-5pp higher on SWE-Bench Verified and HumanEval. DeepSeek V3.2 is 2-3× cheaper but trails on quality. For production coding agents, the Seed 2.0 Code quality premium typically pays off.
Yes via TokenMix.ai OpenAI-compatible gateway (model="bytedance/doubao-seed-2.0-code") or OpenRouter. Zero code changes from GPT-5.4 integration.
No, API-only as of April 22, 2026. Earlier ByteDance Seed variants have open checkpoints on Hugging Face; Seed 2.0 family remains closed.
ByteDance was not named in the April 6-7 Anthropic allegations (which targeted DeepSeek, Moonshot, MiniMax). Seed 2.0 models are not under similar scrutiny. Standard ByteDance geopolitical considerations apply.
Yes — optimized for it. Inline code completion quality is strong, competitive with Codestral and Qwen3-Coder-Plus for VS Code/JetBrains inline suggestions.
Not available via API as of April 2026. ByteDance offers enterprise custom fine-tuning via direct Volcano Engine contracts for qualifying accounts. For open fine-tuning, use GLM-5.1 (MIT) or Qwen3-Coder-Plus instead.
By TokenMix Research Lab · Updated 2026-04-22