Doubao Seed 2.0 Pro vs Claude Mythos Preview

Doubao Seed 2.0 Pro (2026) and Claude Mythos Preview (2026) are frontier reasoning models from ByteDance and Anthropic. 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.

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
SignalDoubao Seed 2.0 ProClaude Mythos Preview
Best formultimodal apps and tool-calling agentsreasoning-heavy apps, multimodal apps, and tool-calling agents
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window256K1M
Cheapest output$2.37/1M tokens$125/1M tokens
Provider routes1 tracked2 tracked
Shared benchmarks3 sharedSWE-bench Verified leader

Decision tradeoffs

Choose Doubao Seed 2.0 Pro when...
  • Doubao Seed 2.0 Pro holds a shared-benchmark lead on τ-bench, ahead by 1.2 points.
  • Doubao Seed 2.0 Pro has the lower cheapest tracked output price at $2.37/1M tokens.
  • Local decision data tags Doubao Seed 2.0 Pro for Coding, RAG, and Agents.
Choose Claude Mythos Preview when...
  • 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 route flexibility.
  • Claude Mythos Preview uniquely exposes Reasoning, Structured outputs, and Code execution 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.

Lower estimate Doubao Seed 2.0 Pro

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

Doubao Seed 2.0 Pro -> Claude Mythos Preview
  • No overlapping tracked provider route is sourced for 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, Structured outputs, and Code execution in local capability data.
Claude Mythos Preview -> Doubao Seed 2.0 Pro
  • No overlapping tracked provider route is sourced for Claude Mythos Preview and Doubao Seed 2.0 Pro; plan for SDK, billing, or endpoint changes.
  • 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, Structured outputs, and Code execution before moving production traffic.

Specs

Specification
Released2026-02-142026-05-01
Context window256K1M
Parameters——
Architecture-Decoder Only
LicenseProprietaryProprietary
OpennessProprietaryProprietary
WeightsNot releasedNot released
CodeUnknownUnknown
Commercial useRestrictedRestricted
Knowledge cutoff-2025-12

Pricing and availability

Pricing attributeDoubao Seed 2.0 ProClaude Mythos Preview
Input price$0.47/1M tokens$25/1M tokens
Output price$2.37/1M tokens$125/1M tokens
Providers
Volcengine
AnthropicMicrosoft Foundry

Capabilities

CapabilityDoubao Seed 2.0 ProClaude Mythos Preview
VisionYesYes
MultimodalYesYes
ReasoningNoYes
JSON / Tool useYesYes
Structured outputsNoYes
Code executionNoYes
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

BenchmarkDoubao Seed 2.0 ProClaude Mythos Preview
SWE-bench Verified76.593.9
Google-Proof Q&A88.994.6
τ-bench90.489.2

Deep dive

On shared benchmark coverage, SWE-bench Verified has 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 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 Doubao Seed 2.0 Pro at 90.4 and Claude Mythos Preview at 89.2, with 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, JSON / Tool use: Claude Mythos Preview, structured outputs: Claude Mythos Preview, and code execution: Claude Mythos Preview. Both models share vision, multimodal input, and JSON / Tool use, 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, Doubao Seed 2.0 Pro lists $0.47/1M input and $2.37/1M output tokens on the cheapest listed provider, while Claude Mythos Preview lists $25/1M input and $125/1M output tokens on the cheapest listed provider. A 70/30 input-output blend puts 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 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, Doubao Seed 2.0 Pro or Claude Mythos Preview?

Claude Mythos Preview supports 1M tokens, while 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, Doubao Seed 2.0 Pro or Claude Mythos Preview?

Doubao Seed 2.0 Pro is cheaper on listed token pricing. 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 Doubao Seed 2.0 Pro or Claude Mythos Preview open source?

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, Doubao Seed 2.0 Pro or Claude Mythos Preview?

Both 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, Doubao Seed 2.0 Pro or Claude Mythos Preview?

Both 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 Doubao Seed 2.0 Pro and Claude Mythos Preview?

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: 2026-11-09. Data sourced from public model cards and provider documentation.