ByteDance Doubao Seed 2.0 Code vs Claude Mythos Preview

ByteDance Doubao Seed 2.0 Code (2026) and Claude Mythos Preview (2026) are frontier reasoning models from ByteDance and Anthropic. ByteDance Doubao Seed 2.0 Code ships a 128k-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.

Claude Mythos Preview fits 8x more tokens; pick it for long-context work and ByteDance Doubao Seed 2.0 Code for tighter calls.

Decision scorecard

Local evidence first
SignalByteDance Doubao Seed 2.0 CodeClaude Mythos Preview
Best fortool-calling agentsreasoning-heavy apps, multimodal apps, and tool-calling agents
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window128k1m
Cheapest output-$125/1M tokens
Provider routes1 tracked2 tracked
Shared benchmarks1 sharedSWE-bench Verified leader

Decision tradeoffs

Choose ByteDance Doubao Seed 2.0 Code when...
  • Local decision data tags ByteDance Doubao Seed 2.0 Code 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 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 route or tier on this page.

ByteDance Doubao Seed 2.0 Code

Unavailable

No complete token price in local provider data

Claude Mythos Preview

$51,250

Cheapest tracked route/tier: Anthropic

Cost delta unavailable until both models have sourced input and output token prices.

Switch friction

ByteDance Doubao Seed 2.0 Code -> Claude Mythos Preview
  • No overlapping tracked provider route is sourced for ByteDance Doubao Seed 2.0 Code and Claude Mythos Preview; plan for SDK, billing, or endpoint changes.
  • Claude Mythos Preview adds Vision, Multimodal, and Reasoning in local capability data.
Claude Mythos Preview -> ByteDance Doubao Seed 2.0 Code
  • No overlapping tracked provider route is sourced for Claude Mythos Preview and ByteDance Doubao Seed 2.0 Code; plan for SDK, billing, or endpoint changes.
  • Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.

Specs

Specification
Released2026-02-142026-05-01
Context window128k1m
Parameters——
Architecture-Decoder Only
LicenseProprietaryProprietary
OpennessProprietaryProprietary
WeightsNot releasedNot released
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: conditional
Knowledge cutoff-2025-12

Pricing and availability

Pricing attributeByteDance Doubao Seed 2.0 CodeClaude Mythos Preview
Input price-$25/1M tokens
Output price-$125/1M tokens
Providers
Volcengine
AnthropicMicrosoft Foundry

Capabilities

CapabilityByteDance Doubao Seed 2.0 CodeClaude Mythos Preview
VisionNoYes
MultimodalNoYes
ReasoningNoYes
JSON / Tool useYesYes
Structured outputsNoYes
Code executionNoYes
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

BenchmarkByteDance Doubao Seed 2.0 CodeClaude Mythos Preview
SWE-bench Verified76.593.9

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Model pages
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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.