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. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing.
Claude Mythos Preview fits 8x more tokens; pick it for long-context work and Gemini Robotics-ER 1.6 Preview for tighter calls.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-04-07 | 2026-04-14 |
| Context window | 1M | 128K |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-12 | - |
Pricing and availability
| Pricing attribute | Claude Mythos Preview | Gemini Robotics-ER 1.6 Preview |
|---|---|---|
| Input price | - | - |
| Output price | - | - |
| Providers | - | - |
Pricing not yet sourced for either model.
Capabilities
| Capability | Claude Mythos Preview | Gemini Robotics-ER 1.6 Preview |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on code execution: Claude Mythos Preview. Both models share vision, multimodal input, reasoning mode, 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.
Pricing coverage is uneven: Claude Mythos Preview has no token price sourced yet and Gemini Robotics-ER 1.6 Preview has no token price sourced yet. Provider availability is 0 tracked routes versus 0. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose Claude Mythos Preview when coding workflow support and larger context windows are central to the workload. Choose Gemini Robotics-ER 1.6 Preview when vision-heavy evaluation are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency. For teams standardizing a stack, that distinction is often the difference between a benchmark win and a reliable deployment.
FAQ
Which has a larger context window, Claude Mythos Preview or Gemini Robotics-ER 1.6 Preview?
Claude Mythos Preview supports 1M tokens, while Gemini Robotics-ER 1.6 Preview supports 128K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Is Claude Mythos Preview or Gemini Robotics-ER 1.6 Preview open source?
Claude Mythos Preview is listed under Proprietary. Gemini Robotics-ER 1.6 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, Claude Mythos Preview or Gemini Robotics-ER 1.6 Preview?
Both Claude Mythos Preview and Gemini Robotics-ER 1.6 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, Claude Mythos Preview or Gemini Robotics-ER 1.6 Preview?
Both Claude Mythos Preview and Gemini Robotics-ER 1.6 Preview expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for reasoning mode, Claude Mythos Preview or Gemini Robotics-ER 1.6 Preview?
Both Claude Mythos Preview and Gemini Robotics-ER 1.6 Preview expose reasoning mode. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
When should I pick Claude Mythos Preview over Gemini Robotics-ER 1.6 Preview?
Claude Mythos Preview fits 8x more tokens; pick it for long-context work and Gemini Robotics-ER 1.6 Preview for tighter calls. If your workload also depends on coding workflow support, start with Claude Mythos Preview; if it depends on vision-heavy evaluation, run the same evaluation with Gemini Robotics-ER 1.6 Preview.
Continue comparing
Last reviewed: 2026-05-01. Data sourced from public model cards and provider documentation.