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, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
ByteDance Doubao Seed 2.0 Pro is ~5219% cheaper at $0.47/1M; pay for Claude Mythos Preview only for coding workflow support.
Decision scorecard
Local evidence first| Signal | ByteDance Doubao Seed 2.0 Pro | Claude Mythos Preview |
|---|---|---|
| Best for | multimodal apps and tool-calling agents | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 256k | 1m |
| Cheapest output | $2.37/1M tokens | $125/1M tokens |
| Provider routes | 1 tracked | 2 tracked |
| Shared benchmarks | 3 shared | SWE-bench Verified leader |
Decision tradeoffs
- ByteDance Doubao Seed 2.0 Pro holds a shared-benchmark lead on τ-bench, ahead by 1.2 points.
- ByteDance Doubao Seed 2.0 Pro has the lower cheapest tracked output price at $2.37/1M tokens.
- Local decision data tags ByteDance Doubao Seed 2.0 Pro for Coding, RAG, and Agents.
- Claude Mythos Preview holds a shared-benchmark lead on SWE-bench Verified, ahead 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 Reasoning, Tool use, and Structured outputs 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 route or tier on this page.
ByteDance Doubao Seed 2.0 Pro
$969
Cheapest tracked route/tier: Volcengine
Claude Mythos Preview
$51,250
Cheapest tracked route/tier: Anthropic
Estimated monthly gap: $50,282. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
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 is $123/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Claude Mythos Preview adds Reasoning, Tool use, and Structured outputs 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.
- ByteDance Doubao Seed 2.0 Pro is $123/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning, Tool use, and Structured outputs before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-02-14 | 2026-05-01 |
| Context window | 256k | 1m |
| Parameters | — | — |
| Architecture | - | Decoder Only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | - | 2025-12 |
Pricing and availability
| Pricing attribute | ByteDance Doubao Seed 2.0 Pro | Claude Mythos Preview |
|---|---|---|
| Input price | $0.47/1M tokens | $25/1M tokens |
| Output price | $2.37/1M tokens | $125/1M tokens |
| Providers |
Capabilities
| Capability | ByteDance Doubao Seed 2.0 Pro | Claude Mythos Preview |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | No | Yes |
| Function calling | Yes | Yes |
| Tool use | No | Yes |
| Structured outputs | No | Yes |
| Code execution | No | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
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 |
| τ-bench | 90.4 | 89.2 |
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; τ-bench has ByteDance Doubao Seed 2.0 Pro at 90.4 and Claude Mythos Preview at 89.2, with ByteDance Doubao Seed 2.0 Pro ahead by 1.2 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 reasoning mode: Claude Mythos Preview, tool use: Claude Mythos Preview, structured outputs: Claude Mythos Preview, and code execution: Claude Mythos Preview. Both models share vision, multimodal input, and 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.
For cost, ByteDance Doubao Seed 2.0 Pro lists $0.47/1M input and $2.37/1M output tokens on the cheapest tracked provider, while Claude Mythos Preview lists $25/1M input and $125/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts ByteDance Doubao Seed 2.0 Pro lower by about $53.96 per million blended tokens. Availability is 1 providers versus 2, so concentration risk also matters.
Choose ByteDance Doubao Seed 2.0 Pro when vision-heavy evaluation and lower input-token cost 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.
Which is cheaper, ByteDance Doubao Seed 2.0 Pro or Claude Mythos Preview?
ByteDance Doubao Seed 2.0 Pro is cheaper on tracked token pricing. ByteDance Doubao Seed 2.0 Pro costs $0.47/1M input and $2.37/1M output tokens. Claude Mythos Preview costs $25/1M input and $125/1M output tokens. Provider discounts or batch pricing can still change the final bill.
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?
Both ByteDance Doubao Seed 2.0 Pro and Claude Mythos Preview expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, ByteDance Doubao Seed 2.0 Pro or Claude Mythos Preview?
Both ByteDance Doubao Seed 2.0 Pro and Claude Mythos Preview expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run ByteDance Doubao Seed 2.0 Pro and Claude Mythos Preview?
ByteDance Doubao Seed 2.0 Pro is available on Volcengine. Claude Mythos Preview is available on Anthropic and Microsoft Foundry. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-06-15. Data sourced from public model cards and provider documentation.