Claude Fable 5.1 vs GPT-4.1 Nano
Model Markets Rankings
Intelligence, Cost, and Efficiency
| Ranking | Claude Fable 5.1 | GPT-4.1 Nano |
|---|---|---|
| IntelligenceHigher is better · MM Intelligence v1.4 | #2 of 4698.6 score · 2/3-source partial | UnrankedNot in the 46-model eligible cohort |
| CostLower is better · Published-token output estimate | #44 of 45$0.824 per LiveBench case | UnrankedNot in the 45-model eligible cohort |
| EfficiencyHigher is better · MM Efficiency v1.1 | #22 of 3851.3 score · 2/3-source intelligence | UnrankedNot in the 38-model eligible cohort |
Ranks come from current available eligible cohorts. Intelligence may use a labeled two-of-three partial core. Green highlights appear only when both models are ranked in the same metric, and the three dimensions are not collapsed into an overall winner.
Benchmark Performance
Available Benchmarks
Technical Differences
Side-by-Side Facts
| Field | Claude Fable 5.1 | GPT-4.1 Nano |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Family | Claude 5 1 | Gpt 4 1 |
| Model | Claude Fable 5.1 | GPT-4.1 Nano |
| Version | Claude Fable 5.1 | GPT-4.1 Nano |
| Lifecycle | active | active |
| Released | 2026-09-01 | Unknown |
| Knowledge cutoff | 2026-06-01 | 2024-06-01 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,000K | 1,048K |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Anthropic (Standard) | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, tools |
14 comparable fields · 8 material differences · Pair passes the primary-source comparison gate
Claude Fable 5.1 Capabilities
GPT-4.1 Nano Capabilities
Internal Comparison Graph
Related Comparisons
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|---|---|---|---|
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Claude Fable 5.1Anthropic | vs |  Kimi-K3Moonshot AI | cross-developer peersimage, text |
 MiniMax-M3MiniMax | vs | Claude Fable 5.1Anthropic | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs |  GLM-5.3Z.ai | cross-developer peerstext |
Claude Fable 5.1Anthropic | vs |  Hy4 previewTencent | cross-developer peerstext |
Claude Fable 5.1Anthropic | vs | Seed 2.1 ProByteDance Seed | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs |  Mistral Large 3Mistral AI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Fable 5.1 vs GPT-4.1 Nano FAQs
Is Claude Fable 5.1 or GPT-4.1 Nano better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Fable 5.1 and GPT-4.1 Nano, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Fable 5.1 or GPT-4.1 Nano?+
Claude Fable 5.1 is $10.00 and GPT-4.1 Nano is $0.050 per million tokens, so GPT-4.1 Nano is cheaper on this metric. Claude Fable 5.1 is $50.00 and GPT-4.1 Nano is $0.20 per million tokens, so GPT-4.1 Nano is cheaper on this metric.
Which has a larger context window, Claude Fable 5.1 or GPT-4.1 Nano?+
GPT-4.1 Nano has the larger sourced context window. Claude Fable 5.1 supports 1,000K and GPT-4.1 Nano supports 1,048K.
Which performs better in benchmarks, Claude Fable 5.1 or GPT-4.1 Nano?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Claude Fable 5.1 or GPT-4.1 Nano be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Fable 5.1 is not marked open weight; GPT-4.1 Nano is not marked open weight.
Can Claude Fable 5.1 and GPT-4.1 Nano understand images?+
Claude Fable 5.1 is documented with image input; GPT-4.1 Nano is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Fable 5.1 or GPT-4.1 Nano?+
Claude Fable 5.1 has the larger sourced maximum output: Claude Fable 5.1 supports 128K and GPT-4.1 Nano supports 33K output tokens.
Do Claude Fable 5.1 and GPT-4.1 Nano support reasoning and tool use?+
Claude Fable 5.1: reasoning, tool calling, and image input. GPT-4.1 Nano: tool calling and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Fable 5.1 or GPT-4.1 Nano?+
Claude Fable 5.1 has 1 sourced provider route; GPT-4.1 Nano has 2, so GPT-4.1 Nano has broader tracked availability.
Which offers better value, Claude Fable 5.1 or GPT-4.1 Nano?+
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.