Claude Haiku 4.5 vs Claude Fable 5.2
Claude Fable 5.2: 86.5% average across five Vision Evals tasks (#2 of 67 models). We have not run Claude Haiku 4.5 through Roboflow's Vision Evals, so there is no head-to-head score.
Compare Claude Haiku 4.5 vs Claude Fable 5.2 live
Run the same image across every model that supports a task and compare their outputs side-by-side.
These models don't share enough common tasks for a side-by-side demo. See the comparison table below for their capabilities.
Claude Haiku 4.5 vs Claude Fable 5.2 Comparison Table
Evals updated November 10, 2026Pricing updated November 10, 2026
| Property | Claude Haiku 4.5 | Claude Fable 5.2 |
|---|---|---|
| Organization | Anthropic | Anthropic |
| Category | closed | closed |
| Modality | multimodal | multimodal |
| Release Date | Oct 2025 | Nov 2026 |
| Context Window | 200K | 1.0M |
| Parameters | Unknown | Unknown |
| License | Proprietary | Proprietary |
| Commercial use | commercial use per vendor terms | commercial use per vendor terms |
| Pricing per 1M tokens | ||
| Input $/1M | $1.00 | $8.00 |
| Output $/1M | $5.00 | $40.00 |
| Vision Tasks | ||
| Captioning | Demo | Supported |
| Classification | Demo | Supported |
| Object Detection | Demo | Supported |
| OCR | Demo | Supported |
| Visual Question Answering | Demo | Supported |
| Model Features | ||
Both support 3 more features | ||
Vision Evalsground-truth scores across 5 vision tasks, pooled at low effort | ||
| Overall | Not evaluated | 86.5% |
| Avg cost / sample | – | $0.031 |
| Avg speed / sample | – | 9.33s |
| By task | ||
| Object Detection (low) | – | 81.6% ±0.3, Mean of 3 runs, range 81.2 to 81.9 |
| Object Detection (high) | – | 83.3% ±0.5, Mean of 3 runs, range 82.8 to 83.7 |
| Counting (low) | – | 86.5% ±0.0, Mean of 3 runs, range 86.5 to 86.5 |
| Counting (high) | – | 92.8% ±1.4, Mean of 3 runs, range 91.9 to 94.6 |
| Identification (low) | – | 96.9% ±0.0, Mean of 3 runs, range 96.9 to 96.9 |
| Identification (high) | – | 94.8% ±1.6, Mean of 3 runs, range 93.8 to 96.9 |
| OCR (low) | – | 79.5% |
| by category |
| |
| OCR (high) | – | 84.8% |
| by category |
| |
| Reasoning (low) | – | 88.1% ±1.3, Mean of 3 runs, range 86.8 to 89.4 |
| Reasoning (high) | – | 92.0% ±1.0, Mean of 3 runs, range 91.4 to 93.4 |
Claude Haiku 4.5 vs Claude Fable 5.2: Overview
Claude Haiku 4.5 is Anthropic’s lightweight model in the Claude 4.5 series, released in October 2025 under a proprietary license. Designed for speed and cost efficiency, it delivers near-frontier performance while maintaining Anthropic’s AI Safety Level 2 standard. Haiku 4.5 supports both text and multimodal (text and image) inputs, integrates tool use and extended reasoning, and features a 200,000 token context window, making it adept at handling long or complex workflows. Haiku 4.5 is ideal for developers and researchers seeking rapid, cost-effective model calls for analysis, coding, or multimodal understanding.
Claude Fable 5.2 is a proprietary multimodal model from Anthropic, released on November 9, 2026. It accepts text and images and produces text, with a one million token context window and up to 128,000 output tokens. Adaptive thinking is always enabled, with an effort setting that controls reasoning. Anthropic positions Fable for demanding reasoning and long-running technical work, including coding and analysis of visual inputs.
Fable 5.2 succeeds Fable 5.1. Anthropic reports improvements in coding, reasoning, and vision, with output generation up to 30% faster than its predecessor. Fable and Mythos 5.2 share an underlying model, with additional cybersecurity and biology safeguards applied to Fable. Model weights are not publicly released.