Claude Fable 5.1 vs Claude Haiku 4.5
Benchmark Performance
Available Benchmarks
Technical Differences
Side-by-Side Facts
| Field | Claude Fable 5.1 | Claude Haiku 4.5 |
|---|---|---|
| Developer | Anthropic | Anthropic |
| Family | Claude 5 1 | Claude 4 5 |
| Model | Claude Fable 5.1 | Claude Haiku 4.5 |
| Version | Claude Fable 5.1 | Claude Haiku 4.5 |
| Lifecycle | active | active |
| Released | 2026-09-01 | 2025-10-15 |
| Knowledge cutoff | 2026-06-01 | Unknown |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,000,000 | 200,000 |
| 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 | Unknown | Anthropic (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, tools |
13 comparable fields · 5 material differences · Pair passes the primary-source comparison gate
Claude Fable 5.1 Capabilities
Claude Haiku 4.5 Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
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Claude Fable 5.1Anthropic | vs |  GPT-5.6 SolOpenAI | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs |  Gemini 3.1 ProGoogle DeepMind | cross-developer peerstext |
Claude Fable 5.1Anthropic | vs | Grok 4.6xAI | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs |  Kimi-K3Moonshot AI | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs |  DeepSeek-V4-Flash-Vision-ExpDeepSeek | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs |  Hy4 previewTencent | cross-developer peerstext |
Claude Fable 5Anthropic | vs | Claude Haiku 4.5Anthropic | family variantsimage, text |
Claude Fable 5.1Anthropic | vs | GPT-5.6 LunaOpenAI | cross-developer peersimage, text |
 Qwen3.5-35B-A3BQwen | vs | Claude Haiku 4.5Anthropic | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Fable 5.1 vs Claude Haiku 4.5 FAQs
Is Claude Fable 5.1 or Claude Haiku 4.5 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Fable 5.1 and Claude Haiku 4.5, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Fable 5.1 or Claude Haiku 4.5?+
Only Claude Haiku 4.5 has a directly sourced input price: $1.00 per million tokens. Only Claude Haiku 4.5 has a directly sourced output price: $5.00 per million tokens.
Which has a larger context window, Claude Fable 5.1 or Claude Haiku 4.5?+
Claude Fable 5.1 has the larger sourced context window. Claude Fable 5.1 supports 1,000,000 and Claude Haiku 4.5 supports 200,000.
Which performs better in benchmarks, Claude Fable 5.1 or Claude Haiku 4.5?+
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 Claude Haiku 4.5 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Fable 5.1 is not marked open weight; Claude Haiku 4.5 is not marked open weight.
Can Claude Fable 5.1 and Claude Haiku 4.5 understand images?+
Claude Fable 5.1 is documented with image input; Claude Haiku 4.5 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Fable 5.1 or Claude Haiku 4.5?+
Claude Fable 5.1 has the larger sourced maximum output: Claude Fable 5.1 supports 128,000 and Claude Haiku 4.5 supports 64,000 output tokens.
Do Claude Fable 5.1 and Claude Haiku 4.5 support reasoning and tool use?+
Claude Fable 5.1: reasoning, tool calling, and image input. Claude Haiku 4.5: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Fable 5.1 or Claude Haiku 4.5?+
Claude Fable 5.1 has 0 sourced provider routes; Claude Haiku 4.5 has 1, so Claude Haiku 4.5 has broader tracked availability.
Which offers better value, Claude Fable 5.1 or Claude Haiku 4.5?+
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.