LLM Reference

Claude Mythos Preview vs Gemini Robotics-ER 1.6 Preview

Claude Mythos Preview (2026) and Gemini Robotics-ER 1.6 Preview (2026) are frontier-tier reasoning models from Anthropic and Google DeepMind. Claude Mythos Preview ships a 1m-token context window, while Gemini Robotics-ER 1.6 Preview ships a 128k-token context window. On pricing, Gemini Robotics-ER 1.6 Preview costs $1/1M input tokens versus $25/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

Gemini Robotics-ER 1.6 Preview is ~2400% cheaper at $1/1M; pay for Claude Mythos Preview only for coding workflow support.

Decision scorecard

Local evidence first
SignalClaude Mythos PreviewGemini Robotics-ER 1.6 Preview
Best forreasoning-heavy apps, multimodal apps, and tool-calling agentsreasoning-heavy apps, multimodal apps, and tool-calling agents
Decision fitCoding, RAG, and AgentsRAG, Agents, and Long context
Context window1m128k
Cheapest output$125/1M tokens$5/1M tokens
Provider routes2 tracked1 tracked
Shared benchmarks0 shared0 shared

Decision tradeoffs

Choose Claude Mythos Preview when...
  • 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 Code execution in local model data.
  • Local decision data tags Claude Mythos Preview for Coding, RAG, and Agents.
Choose Gemini Robotics-ER 1.6 Preview when...
  • Gemini Robotics-ER 1.6 Preview has the lower cheapest tracked output price at $5/1M tokens.
  • Local decision data tags Gemini Robotics-ER 1.6 Preview for RAG, Agents, and Long context.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Lower estimate Gemini Robotics-ER 1.6 Preview

Claude Mythos Preview

$51,250

Cheapest tracked route/tier: Anthropic

Gemini Robotics-ER 1.6 Preview

$2,050

Cheapest tracked route/tier: Google AI Studio

Estimated monthly gap: $49,200. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Claude Mythos Preview -> Gemini Robotics-ER 1.6 Preview
  • No overlapping tracked provider route is sourced for Claude Mythos Preview and Gemini Robotics-ER 1.6 Preview; plan for SDK, billing, or endpoint changes.
  • Gemini Robotics-ER 1.6 Preview is $120/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Code execution before moving production traffic.
Gemini Robotics-ER 1.6 Preview -> Claude Mythos Preview
  • No overlapping tracked provider route is sourced for Gemini Robotics-ER 1.6 Preview and Claude Mythos Preview; plan for SDK, billing, or endpoint changes.
  • Claude Mythos Preview is $120/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Claude Mythos Preview adds Code execution in local capability data.

Specs

Specification
Released2026-05-012026-04-14
Context window1m128k
Parameters——
ArchitectureDecoder OnlyDecoder Only
LicenseProprietaryProprietary
OpennessProprietaryProprietary
WeightsNot releasedNot released
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: conditional
Knowledge cutoff2025-12-

Pricing and availability

Pricing attributeClaude Mythos PreviewGemini Robotics-ER 1.6 Preview
Input price$25/1M tokens$1/1M tokens
Output price$125/1M tokens$5/1M tokens
Providers
AnthropicMicrosoft Foundry
Google AI Studio

Capabilities

CapabilityClaude Mythos PreviewGemini Robotics-ER 1.6 Preview
VisionYesYes
MultimodalYesYes
ReasoningYesYes
JSON / Tool useYesYes
Structured outputsYesYes
Code executionYesNo
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

No shared benchmark scores are currently available for this pair.

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