Data points: 125
Model compare
The readout for Claude Fable 5 and GPT-5.1, before the detailed comparison sheet.
Weighted outcome: Claude Fable 5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
Claude Fable 5
Claude Fable 5 has the higher weighted result; Model A / B score 64 to 36.
Evidence depth
125 data points
Includes 23 benchmark rows, 3 audit samples, and 6 provider examples.
Selection signal
Start with Claude Fable 5
The charts below split 32 high-signal samples across speed, scores, and audit health.
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
This report only uses LMSpeed data for Claude Fable 5 and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Claude Fable 5 | GPT-5.1 |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 64.0 pts | 36.0 pts |
| Benchmark category leads | 4 categories | 1 categories |
| Operational advantages | No data | Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage |
| Context window | 1M tokens | 400K tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input TextImageFile Output Text |
The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.
| Model compare | Claude Fable 5 | GPT-5.1 |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Released | Jun 2026 | Nov 2025 |
| Parameters | No data | No data |
| Tokenizer | Claude | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | anthropic/claude-fable-5 | openai/gpt-5.1 |
| References | No data | No data |
This report only uses LMSpeed data for Claude Fable 5 and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Claude Fable 5
Claude Fable 5 leads these benchmark categories: Agents, Coding, Reasoning, Knowledge.
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Instruction following) and operational dimensions (Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage).
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
Claude Fable 5
58.7
Avg. score
GPT-5.1
52
Claude Fable 5 leads by 18.8
Claude Fable 5 leads by 18.8
Claude Fable 5 leads by 8.3
Claude Fable 5 leads by 6.3
GPT-5.1
No data
Claude Fable 5
GPT-5.1 leads by 3.3
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Claude Fable 5
winner80.0
Rank #2/84 · confidence 2 · eval date 2026-06-09
GPT-5.1
56.0
Rank #41/84 · confidence 1 · eval date 2025-11-13
Claude Fable 5
$10.00/M
Rank #153/162 · confidence 4
GPT-5.1
winner$1.25/M
Rank #107/162 · confidence 4
Claude Fable 5
$20.00/M
Rank #154/162 · confidence 4
GPT-5.1
winner$3.44/M
Rank #117/162 · confidence 4
Claude Fable 5
$50.00/M
Rank #154/162 · confidence 4
GPT-5.1
winner$10.00/M
Rank #120/162 · confidence 4
Claude Fable 5
70.0
Rank #19/89 · confidence 2 · eval date 2026-06-09
GPT-5.1
winner75.0
Rank #3/89 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner53.3%
Rank #4/187 · confidence 4
GPT-5.1
26.5%
Rank #40/187 · confidence 4
Claude Fable 5
winner28.6
Rank #5/73 · confidence 2 · eval date 2026-06-09
GPT-5.1
4.9
Rank #34/73 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner92.6%
Rank #8/188 · confidence 4
GPT-5.1
87.3%
Rank #33/188 · confidence 4
Claude Fable 5
winner60.2
Rank #1/96 · confidence 2 · eval date 2026-06-09
GPT-5.1
43.3
Rank #45/96 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner60.2%
Rank #1/185 · confidence 4
GPT-5.1
43.3%
Rank #42/185 · confidence 4
Claude Fable 5
winner76.5
Rank #3/59 · confidence 2 · eval date 2026-06-09
GPT-5.1
49.4
Rank #32/59 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner53.3
Rank #1/96 · confidence 2 · eval date 2026-06-09
GPT-5.1
26.5
Rank #39/96 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner61.4
Rank #1/90 · confidence 2 · eval date 2026-06-09
GPT-5.1
37.6
Rank #31/90 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner40.2
Rank #1/29 · confidence 2 · eval date 2026-06-09
GPT-5.1
5.6
Rank #19/29 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner59.9
Rank #1/99 · confidence 2 · eval date 2026-06-09
GPT-5.1
36.9
Rank #42/99 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner92.6
Rank #7/96 · confidence 2 · eval date 2026-06-09
GPT-5.1
87.3
Rank #36/96 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner54.9
Rank #62/90 · confidence 2 · eval date 2026-06-09
GPT-5.1
51.3
Rank #65/90 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner1332.0
Rank #3/66 · confidence 2 · eval date 2026-06-09
GPT-5.1
1217.0
Rank #39/66 · confidence 1 · eval date 2025-11-13
Claude Fable 5
63.5
Rank #49/86 · confidence 2 · eval date 2026-06-09
GPT-5.1
winner72.9
Rank #30/86 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner1747.0
Rank #1/55 · confidence 2 · eval date 2026-06-09
GPT-5.1
988.0
Rank #35/55 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner62.3
Rank #1/50 · confidence 2 · eval date 2026-06-09
GPT-5.1
24.4
Rank #35/50 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner52.8
Rank #2/55 · confidence 2 · eval date 2026-06-09
GPT-5.1
21.0
Rank #36/55 · confidence 1 · eval date 2025-11-13
Claude Fable 5
winner98.5
Rank #2/84 · confidence 2 · eval date 2026-06-09
GPT-5.1
81.9
Rank #52/84 · confidence 1 · eval date 2025-11-13
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude Fable 5 | GPT-5.1 |
|---|---|---|
Winner: Claude Fable 5 | Claude Fable 5 claude-fable-5 Audit score 79 648468100 | GPT-5.1 gpt-5.1-medium No audit yet |
Winner: Claude Fable 5 | Claude Fable 5 claude-fable-5 Audit score 78 70728088 | GPT-5.1 gpt-5.1 No audit yet |
Winner: Claude Fable 5 | Claude Fable 5 claude-fable-5 Audit score 78 70728088 | GPT-5.1 gpt-5.1-chat No audit yet |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | Claude Fable 5 | GPT-5.1 |
|---|---|---|
10 tests | Claude Fable 5 claude-fable-5 speed / latency N/A / N/A input / output $0.279/M/$1.40/M | GPT-5.1 gpt-5.1-all speed / latency 137 tok/s / 3299ms input / output $0.040/M/$0.323/M |
5 tests | Claude Fable 5 speed / latency 39 tok/s / 3109ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
5 tests | Claude Fable 5 speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data |
5 tests | Claude Fable 5 speed / latency 134 tok/s / 1876ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
5 tests | Claude Fable 5 speed / latency 46 tok/s / 3687ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
Claude Fable 5 claude-fable-5 speed / latency No data input / output $0/request | GPT-5.1 gpt-5.1-chat-latest speed / latency No data input / output $0/request |
Weighted outcome: Claude Fable 5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Input
Output
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
