MolmoAct2 Think vs Claude Fable 5.1
At a Glance
| Compare | Claude Fable 5.1Anthropic | |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | UnrankedNot in the 46-model eligible cohort | #1 of 4699.0 score · 3/3 sources · complete |
| CostLower is better · Published-token output estimate | UnrankedNot in the 44-model eligible cohort | #43 of 44$0.824 per LiveBench case |
| EfficiencyHigher is better · MM Efficiency v1.5 | UnrankedNot in the 38-model eligible cohort | #22 of 3851.7 score · 3/3 sources · complete |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | Not reported | $10.00Anthropic ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | Not reported | $50.00Anthropic ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | 16K | 1,000K |
| Model facts checked | Aug 28, 2026View model evidence → | Sep 2, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
Side-by-Side Facts
| Field | MolmoAct2-Think | Claude Fable 5.1 |
|---|---|---|
| Developer | Ai2 | Anthropic |
| Family | Molmoact2 Think | Claude 5 1 |
| Model | MolmoAct2-Think | Claude Fable 5.1 |
| Version | MolmoAct2-Think | Claude Fable 5.1 |
| Lifecycle | active | active |
| Released | Unknown | 2026-09-01 |
| Knowledge cutoff | Unknown | 2026-06-01 |
| Input modalities | Model-specific input | Text, Image |
| Output modalities | Model-specific input | Text |
| Context window | 16K | 1,000K |
| Total parameters | 5.4B | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | Yes | No |
| API available | Unknown | Yes |
| Self-hostable | Yes | No |
| Provider access | Unknown | Anthropic (Standard) |
| Capabilities | reasoning, robot_action_generation | chat, generation, reasoning, tools |
MolmoAct2 Think Capabilities
Claude Fable 5.1 Capabilities
Related Comparisons
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|---|---|---|---|
| vs | Claude Fable 5Anthropic | cross-developer peersimage, text | |
| vs |  GPT-6 AstraOpenAI | cross-developer peersimage, text | |
| vs |  Gemini 3.1 ProGoogle DeepMind | cross-developer peerstext | |
| vs |  DeepSeek-V4.1-FlashDeepSeek | cross-developer peersimage, text | |
| vs | Grok 4.6xAI | cross-developer peersimage, text | |
| vs |  Qwen3.8-MaxQwen | cross-developer peersimage, text | |
| vs |  Kimi-K3Moonshot AI | cross-developer peersimage, text | |
 MiniMax-M3MiniMax | vs | cross-developer peersimage, text | |
| vs |  GLM-5.3Z.ai | cross-developer peerstext | |
| vs |  Hy4 previewTencent | cross-developer peerstext | |
| vs | Seed 2.1 ProByteDance Seed | cross-developer peersimage, text | |
| vs |  Mistral Large 3Mistral AI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
MolmoAct2 Think vs Claude Fable 5.1 FAQs
Is MolmoAct2 Think or Claude Fable 5.1 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both MolmoAct2 Think and Claude Fable 5.1, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, MolmoAct2 Think or Claude Fable 5.1?+
Only Claude Fable 5.1 has a directly sourced input price: $10.00 per million tokens. Only Claude Fable 5.1 has a directly sourced output price: $50.00 per million tokens.
Which has a larger context window, MolmoAct2 Think or Claude Fable 5.1?+
Claude Fable 5.1 has the larger sourced context window. MolmoAct2 Think supports 16K and Claude Fable 5.1 supports 1,000K.
Which performs better in benchmarks, MolmoAct2 Think or Claude Fable 5.1?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can MolmoAct2 Think or Claude Fable 5.1 be self-hosted?+
MolmoAct2 Think is the only model in this pair currently marked as self-hostable. MolmoAct2 Think is open weight; Claude Fable 5.1 is not marked open weight.
Can MolmoAct2 Think and Claude Fable 5.1 understand images?+
MolmoAct2 Think is not documented with image input; Claude Fable 5.1 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, MolmoAct2 Think or Claude Fable 5.1?+
Neither has a larger sourced maximum output. MolmoAct2 Think is — and Claude Fable 5.1 is 128K.
Do MolmoAct2 Think and Claude Fable 5.1 support reasoning and tool use?+
MolmoAct2 Think: reasoning. Claude Fable 5.1: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, MolmoAct2 Think or Claude Fable 5.1?+
MolmoAct2 Think has 0 sourced provider routes; Claude Fable 5.1 has 1, so Claude Fable 5.1 has broader tracked availability.
Which offers better value, MolmoAct2 Think or Claude Fable 5.1?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.