Claude Fable 5.1 vs Claude Sonnet 4.6: Release Comparison
Comparison of the Claude Fable 5.1 and Claude Sonnet 4.6 releases: 5 and 3 models respectively, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across all 8 models.
- For intelligence, Claude Fable 5.1 scores highest: Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) at 53, against Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) at 30 for Claude Sonnet 4.6.
- For output speed, Claude Fable 5.1 is fastest: Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) at 65 t/s, against Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) at 45 t/s for Claude Sonnet 4.6.
- For cost per task, Claude Fable 5.1 is cheapest: Claude Fable 5.1 (Adaptive Reasoning, Low Effort, Default Fallback) at $2.37, against Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) at $2.49 for Claude Sonnet 4.6.
Releases compared
Intelligence
Artificial Analysis Intelligence Index
Intelligence Index vs. Cost per Intelligence Index Task
Cost
Cost per Intelligence Index Task
Speed & Latency
Output Speed
Capability Scores
Capability Indices
Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2, AA-Briefcase, Humanity's Last Exam, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better
Incorporates 6 evaluations: AA-Omniscience, GDPval-AA v2, AA-Briefcase, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better
Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2, AA-Briefcase, Humanity's Last Exam, AA-LCR v1.1, GDP.pdf, AutomationBench-AA · Higher is better
Incorporates 6 evaluations: AA-Omniscience, GDPval-AA v2, AA-Briefcase, MLCR-AA, Humanity's Last Exam, AutomationBench-AA · Higher is better
Incorporates 6 evaluations: AA-Omniscience, Humanity's Last Exam, CritPt, GDPval-AA v2, AA-Briefcase, Terminal-Bench 4.0 · Higher is better
Incorporates 5 evaluations: AA-Omniscience, Humanity's Last Exam, GDPval-AA v2, AA-Briefcase, AA-LCR v1.1 · Higher is better
Further details
Input modality | Output modality | Weights | Provider Benchmarks | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) |  Anthropic | 53 | 57 | 60 | 61 | 58 | 57 | 63 | $7.63 | $7.2 | $10.00 | $50.00 | $0.25 | $13,129 | 78k | 47k | 188M | 65 | 210.79s | 210.79s | 218.47s | 761.08s | - | 1M | Sep 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| Claude Fable 5.1 (Adaptive Reasoning, Xhigh Effort, Default Fallback) | Anthropic | 53 | 56 | 58 | 61 | - | 57 | 62 | $5.98 | $7.2 | $10.00 | $50.00 | $0.25 | $9,063 | 61k | 34k | 121M | 58 | 91.63s | 91.63s | 100.23s | 698.65s | - | 1M | Sep 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| Claude Fable 5.1 (Adaptive Reasoning, High Effort, Default Fallback) | Anthropic | 51 | 54 | 56 | 58 | - | 55 | 60 | $3.91 | $7.2 | $10.00 | $50.00 | $0.25 | $5,242 | 38k | 19k | 62M | 51 | 12.45s | 12.45s | 22.32s | 469.10s | - | 1M | Sep 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| Claude Fable 5.1 (Adaptive Reasoning, Medium Effort, Default Fallback) | Anthropic | 49 | 52 | 54 | 57 | - | 52 | 58 | $2.98 | $7.2 | $10.00 | $50.00 | $0.25 | $3,983 | 28k | 12k | 44M | 51 | 6.49s | 6.49s | 16.33s | 337.28s | - | 1M | Sep 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| Claude Fable 5.1 (Adaptive Reasoning, Low Effort, Default Fallback) | Anthropic | 47 | 49 | 52 | 54 | - | 49 | 55 | $2.37 | $7.2 | $10.00 | $50.00 | $0.25 | $3,158 | 22k | 8k | 33M | 50 | 5.23s | 5.23s | 15.15s | 280.39s | - | 1M | Sep 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) | Anthropic | 30 | 34 | 31 | 38 | 32 | 32 | 43 | $2.49 | $2.3 | $3.00 | $15.00 | $0.30 | $4,925 | 75k | 56k | 233M | 45 | 129.84s | 129.84s | 140.84s | 1501.35s | - | 1M | Feb 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - |    | |
| Claude Sonnet 4.6 (Non-reasoning, High Effort) | Anthropic | 25 | - | - | - | - | - | - | - | $2.3 | $3.00 | $15.00 | $0.30 | - | - | - | - | 40 | 1.32s | 1.32s | 13.69s | - | - | 1M | Feb 2026 | - | No | Supports: text and image | Supports: text | Not available | - | | |
| Claude Sonnet 4.6 (Non-reasoning, Low Effort) | Anthropic | 23 | - | - | - | - | - | - | - | $2.3 | $3.00 | $15.00 | $0.30 | - | - | - | - | 40 | 1.41s | 1.41s | 14.00s | - | - | 1M | Feb 2026 | - | No | Supports: text and image | Supports: text | Not available | - | | |