ByteDance Doubao Seed 2.0 Pro vs Claude Mythos Preview
ByteDance Doubao Seed 2.0 Pro (2026) and Claude Mythos Preview (2026) are frontier reasoning models from ByteDance and Anthropic. ByteDance Doubao Seed 2.0 Pro ships a 256k-token context window, while Claude Mythos Preview ships a 1M-token context window. On SWE-bench Verified, Claude Mythos Preview leads by 17.4 pts. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Claude Mythos Preview is safer overall; choose ByteDance Doubao Seed 2.0 Pro when provider fit matters.
Decision scorecard
Local evidence first| Signal | ByteDance Doubao Seed 2.0 Pro | Claude Mythos Preview |
|---|---|---|
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 256k | 1M |
| Cheapest output | - | $125/1M tokens |
| Provider routes | 0 tracked | 2 tracked |
| Shared benchmarks | 2 rows | SWE-bench Verified leader |
Decision tradeoffs
- Local decision data tags ByteDance Doubao Seed 2.0 Pro for Coding, RAG, and Agents.
- Claude Mythos Preview leads the largest shared benchmark signal on SWE-bench Verified by 17.4 points.
- Claude Mythos Preview has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Claude Mythos Preview has broader tracked provider coverage for fallback and procurement flexibility.
- Claude Mythos Preview uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags Claude Mythos Preview for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output prices on this page.
ByteDance Doubao Seed 2.0 Pro
Unavailable
No complete token price in local provider data
Claude Mythos Preview
$51,250
Cheapest tracked route: Anthropic
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for ByteDance Doubao Seed 2.0 Pro and Claude Mythos Preview; plan for SDK, billing, or endpoint changes.
- Claude Mythos Preview adds Vision, Multimodal, and Reasoning in local capability data.
- No overlapping tracked provider route is sourced for Claude Mythos Preview and ByteDance Doubao Seed 2.0 Pro; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-02-14 | 2026-04-07 |
| Context window | 256k | 1M |
| Parameters | — | — |
| Architecture | - | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | - | 2025-12 |
Pricing and availability
| Pricing attribute | ByteDance Doubao Seed 2.0 Pro | Claude Mythos Preview |
|---|---|---|
| Input price | - | $25/1M tokens |
| Output price | - | $125/1M tokens |
| Providers | - |
Capabilities
| Capability | ByteDance Doubao Seed 2.0 Pro | Claude Mythos Preview |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | No | Yes |
| Function calling | Yes | Yes |
| Tool use | No | Yes |
| Structured outputs | No | Yes |
| Code execution | No | Yes |
Benchmarks
| Benchmark | ByteDance Doubao Seed 2.0 Pro | Claude Mythos Preview |
|---|---|---|
| SWE-bench Verified | 76.5 | 93.9 |
| Google-Proof Q&A | 88.9 | 94.6 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has ByteDance Doubao Seed 2.0 Pro at 76.5 and Claude Mythos Preview at 93.9, with Claude Mythos Preview ahead by 17.4 points; Google-Proof Q&A has ByteDance Doubao Seed 2.0 Pro at 88.9 and Claude Mythos Preview at 94.6, with Claude Mythos Preview ahead by 5.7 points. The largest visible gap is 17.4 points on SWE-bench Verified, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on vision: Claude Mythos Preview, multimodal input: Claude Mythos Preview, reasoning mode: Claude Mythos Preview, tool use: Claude Mythos Preview, structured outputs: Claude Mythos Preview, and code execution: Claude Mythos Preview. Both models share function calling, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
Pricing coverage is uneven: ByteDance Doubao Seed 2.0 Pro has no token price sourced yet and Claude Mythos Preview has $25/1M input tokens. Provider availability is 0 tracked routes versus 2. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose ByteDance Doubao Seed 2.0 Pro when provider fit are central to the workload. Choose Claude Mythos Preview when coding workflow support, larger context windows, and broader provider choice are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, ByteDance Doubao Seed 2.0 Pro or Claude Mythos Preview?
Claude Mythos Preview supports 1M tokens, while ByteDance Doubao Seed 2.0 Pro supports 256k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Is ByteDance Doubao Seed 2.0 Pro or Claude Mythos Preview open source?
ByteDance Doubao Seed 2.0 Pro is listed under Proprietary. Claude Mythos Preview is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, ByteDance Doubao Seed 2.0 Pro or Claude Mythos Preview?
Claude Mythos Preview has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for multimodal input, ByteDance Doubao Seed 2.0 Pro or Claude Mythos Preview?
Claude Mythos Preview has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for reasoning mode, ByteDance Doubao Seed 2.0 Pro or Claude Mythos Preview?
Claude Mythos Preview has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run ByteDance Doubao Seed 2.0 Pro and Claude Mythos Preview?
ByteDance Doubao Seed 2.0 Pro is available on the tracked providers still being sourced. Claude Mythos Preview is available on Anthropic and Microsoft Foundry. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-16. Data sourced from public model cards and provider documentation.