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 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.
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, Structured outputs, and Code execution 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, Structured outputs, and Code execution 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 |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| 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 |
| JSON / Tool use | Yes | 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 |
Continue comparing
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- Claude Mythos Preview vs Grok 4.3
- ByteDance Doubao Seed 2.0 Code vs Claude Mythos Preview
- Claude Mythos Preview vs GPT-5.5 Pro
- Claude Mythos Preview vs DeepSeek V4 Flash
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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.