Data points: 156
Model compare
The readout for Claude Fable 5 and GPT-5.4, 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 61.3 to 38.7.
Evidence depth
156 data points
Includes 31 benchmark rows, 6 audit samples, and 7 provider examples.
Selection signal
Start with Claude Fable 5
The charts below split 44 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-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Claude Fable 5 | GPT-5.4 |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 61.3 pts | 38.7 pts |
| Benchmark category leads | 4 categories | 2 categories |
| Operational advantages | Average speed, First-token latency | Cheapest input price, Free providers, Provider coverage |
| Context window | 1M tokens | 1.1M 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-5.4 |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Released | Jun 2026 | Mar 2026 |
| Parameters | No data | No data |
| Tokenizer | Claude | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | anthropic/claude-fable-5 | openai/gpt-5.4 |
| References | No data | No data |
This report only uses LMSpeed data for Claude Fable 5 and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Claude Fable 5
Claude Fable 5 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge) and operational dimensions (Average speed, First-token latency).
GPT-5.4
GPT-5.4 is stronger in benchmark categories (Multimodal, Instruction following) and operational dimensions (Cheapest input price, 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-5.4
57.4
Claude Fable 5 leads by 10.4
Claude Fable 5 leads by 5.0
Claude Fable 5 leads by 4.3
Claude Fable 5 leads by 0.3
GPT-5.4
No data
GPT-5.4 leads by 8.3
GPT-5.4 leads by 3.7
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-5.4
67.0
Rank #19/84 · confidence 3 · eval date 2026-03-05
Claude Fable 5
$10.00/M
Rank #153/162 · confidence 4
GPT-5.4
winner$2.50/M
Rank #131/162 · confidence 4
Claude Fable 5
$20.00/M
Rank #154/162 · confidence 4
GPT-5.4
winner$5.63/M
Rank #135/162 · confidence 4
Claude Fable 5
$50.00/M
Rank #154/162 · confidence 4
GPT-5.4
winner$15.00/M
Rank #136/162 · confidence 4
Claude Fable 5
winner53.3%
Rank #4/187 · confidence 4
GPT-5.4
10.6%
Rank #91/187 · confidence 4
Claude Fable 5
winner28.6
Rank #5/73 · confidence 2 · eval date 2026-06-09
GPT-5.4
23.4
Rank #7/73 · confidence 3 · eval date 2026-03-05
Claude Fable 5
70.0
Rank #19/89 · confidence 2 · eval date 2026-06-09
GPT-5.4
winner74.0
Rank #6/89 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner92.6%
Rank #8/188 · confidence 4
GPT-5.4
74.8%
Rank #96/188 · confidence 4
Claude Fable 5
winner60.2
Rank #1/96 · confidence 2 · eval date 2026-06-09
GPT-5.4
56.6
Rank #4/96 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner83.1
Rank #1/65 · confidence 2 · eval date 2026-06-09
GPT-5.4
42.4
Rank #53/65 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner60.2%
Rank #1/185 · confidence 4
GPT-5.4
47.1%
Rank #24/185 · confidence 4
Claude Fable 5
winner80.0
Rank #1/37 · confidence 2 · eval date 2026-06-09
GPT-5.4
57.7
Rank #15/37 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner76.5
Rank #3/59 · confidence 2 · eval date 2026-06-09
GPT-5.4
71.0
Rank #11/59 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner53.3
Rank #1/96 · confidence 2 · eval date 2026-06-09
GPT-5.4
41.6
Rank #8/96 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner61.4
Rank #1/90 · confidence 2 · eval date 2026-06-09
GPT-5.4
50.0
Rank #9/90 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner40.2
Rank #1/29 · confidence 2 · eval date 2026-06-09
GPT-5.4
5.7
Rank #18/29 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner59.9
Rank #1/99 · confidence 2 · eval date 2026-06-09
GPT-5.4
51.4
Rank #10/99 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner92.6
Rank #7/96 · confidence 2 · eval date 2026-06-09
GPT-5.4
92.0
Rank #11/96 · confidence 3 · eval date 2026-03-05
Claude Fable 5
69.2
Rank #26/55 · confidence 2 · eval date 2026-06-09
GPT-5.4
winner77.3
Rank #16/55 · confidence 3 · eval date 2026-03-05
Claude Fable 5
54.9
Rank #62/90 · confidence 2 · eval date 2026-06-09
GPT-5.4
winner88.6
Rank #18/90 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner1332.0
Rank #3/66 · confidence 2 · eval date 2026-06-09
GPT-5.4
1250.0
Rank #31/66 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner57.9
Rank #3/7 · confidence 2 · eval date 2026-06-09
GPT-5.4
53.2
Rank #5/7 · confidence 3 · eval date 2026-03-05
Claude Fable 5
64.0
Rank #22/35 · confidence 2 · eval date 2026-06-09
GPT-5.4
winner68.5
Rank #14/35 · confidence 3 · eval date 2026-03-05
Claude Fable 5
63.5
Rank #49/86 · confidence 2 · eval date 2026-06-09
GPT-5.4
winner73.9
Rank #24/86 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner1747.0
Rank #1/55 · confidence 2 · eval date 2026-06-09
GPT-5.4
1392.0
Rank #12/55 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner62.3
Rank #1/50 · confidence 2 · eval date 2026-06-09
GPT-5.4
44.6
Rank #12/50 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner85.0
Rank #1/21 · confidence 2 · eval date 2026-06-09
GPT-5.4
75.0
Rank #7/21 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner52.8
Rank #2/55 · confidence 2 · eval date 2026-06-09
GPT-5.4
41.1
Rank #12/55 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner98.5
Rank #2/84 · confidence 2 · eval date 2026-06-09
GPT-5.4
87.1
Rank #37/84 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner93.1
Rank #3/53 · confidence 2 · eval date 2026-06-09
GPT-5.4
74.7
Rank #14/53 · confidence 3 · eval date 2026-03-05
Claude Fable 5
winner84.3
Rank #5/46 · confidence 2 · eval date 2026-06-09
GPT-5.4
75.1
Rank #12/46 · confidence 3 · eval date 2026-03-05
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude Fable 5 | GPT-5.4 |
|---|---|---|
Winner: GPT-5.4 | Claude Fable 5 claude-fable-5 No audit yet | GPT-5.4 gpt-5.4 Audit score 93 1008486100 |
Winner: GPT-5.4 | Claude Fable 5 特价-claude-fable-5 No audit yet | GPT-5.4 gpt-5.4 Audit score 90 1008476100 |
Winner: GPT-5.4 | Claude Fable 5 claude-fable-5 No audit yet | GPT-5.4 gpt-5.4 Audit score 88 8468100100 |
Winner: Claude Fable 5 | Claude Fable 5 claude-fable-5 Audit score 79 648468100 | GPT-5.4 gpt-5.4 No audit yet |
Winner: Claude Fable 5 | Claude Fable 5 claude-fable-5 Audit score 78 648463100 | GPT-5.4 gpt-5.4 No audit yet |
Winner: Claude Fable 5 | Claude Fable 5 claude-fable-5 Audit score 78 70728088 | GPT-5.4 gpt-5.4 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-5.4 |
|---|---|---|
15 tests | Claude Fable 5 speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 41 tok/s / 6581ms input / output No data |
15 tests | Claude Fable 5 speed / latency 46 tok/s / 5519ms input / output No data | GPT-5.4 speed / latency 54 tok/s / 2003ms input / output No data |
10 tests | Claude Fable 5 speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 88 tok/s / 6075ms input / output No data |
10 tests | Claude Fable 5 speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 51 tok/s / 1443ms input / output No data |
10 tests | Claude Fable 5 speed / latency 46 tok/s / 3687ms input / output No data | GPT-5.4 speed / latency 50 tok/s / 1423ms input / output No data |
Claude Fable 5 claude-fable-5 speed / latency No data input / output $0/M/$0/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $0.240/M | |
Claude Fable 5 claude-fable-5 speed / latency No data input / output $0/request | GPT-5.4 gpt-5.4-2026-03-05 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 |
|---|
