Data points: 183
Model compare
The readout for Claude Sonnet 4.6 and GPT-5.5, before the detailed comparison sheet.
Weighted outcome: GPT-5.5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.5
GPT-5.5 has the higher weighted result; Model A / B score 21.4 to 78.6.
Evidence depth
183 data points
Includes 39 benchmark rows, 6 audit samples, and 7 provider examples.
Selection signal
Start with GPT-5.5
The charts below split 52 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 Sonnet 4.6 and GPT-5.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Claude Sonnet 4.6 | GPT-5.5 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 21.4 pts | 78.6 pts |
| Benchmark category leads | 1 categories | 6 categories |
| Operational advantages | First-token latency, Provider coverage | Average speed, Free providers |
| 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 Sonnet 4.6 | GPT-5.5 |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Released | Feb 2026 | Apr 2026 |
| Parameters | No data | No data |
| Tokenizer | Claude | GPT |
| Knowledge cutoff | No data | 2025-12-01 |
| OpenRouter ID | anthropic/claude-sonnet-4.6 | openai/gpt-5.5 |
| References | No data | No data |
This report only uses LMSpeed data for Claude Sonnet 4.6 and GPT-5.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Claude Sonnet 4.6
Claude Sonnet 4.6 is stronger in benchmark categories (Knowledge) and operational dimensions (First-token latency, Provider coverage).
GPT-5.5
GPT-5.5 is stronger in benchmark categories (Agents, Coding, Reasoning, Math, Multimodal) and operational dimensions (Average speed, Free providers).
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 Sonnet 4.6
53.2
Avg. score
GPT-5.5
59
GPT-5.5 leads by 9.0
GPT-5.5 leads by 3.9
GPT-5.5 leads by 11.0
Claude Sonnet 4.6 leads by 10.1
GPT-5.5 leads by 3.7
No data
GPT-5.5 leads by 11.9
GPT-5.5 leads by 11.3
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Claude Sonnet 4.6
64.0
Rank #24/84 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner74.0
Rank #10/84 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
67.8 tok/s
Rank #93/137 · confidence 4
GPT-5.5
winner92.4 tok/s
Rank #70/137 · confidence 4
Claude Sonnet 4.6
winner54.74 s
Rank #125/137 · confidence 4
GPT-5.5
108.56 s
Rank #136/137 · confidence 4
Claude Sonnet 4.6
winner54.74 s
Rank #131/137 · confidence 4
GPT-5.5
108.56 s
Rank #136/137 · confidence 4
Claude Sonnet 4.6
winner$15.00/M
Rank #136/162 · confidence 4
GPT-5.5
$30.00/M
Rank #151/162 · confidence 4
Claude Sonnet 4.6
winner$6.00/M
Rank #137/162 · confidence 4
GPT-5.5
$11.25/M
Rank #151/162 · confidence 4
Claude Sonnet 4.6
winner$3.00/M
Rank #137/162 · confidence 4
GPT-5.5
$5.00/M
Rank #146/162 · confidence 4
Claude Sonnet 4.6
87.5%
Rank #31/188 · confidence 4
GPT-5.5
winner93.5%
Rank #3/188 · confidence 4
Claude Sonnet 4.6
57.7
Rank #63/89 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner74.3
Rank #5/89 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
0.9
Rank #60/73 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner27.1
Rank #6/73 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
30.0%
Rank #31/187 · confidence 4
GPT-5.5
winner44.3%
Rank #7/187 · confidence 4
Claude Sonnet 4.6
48.8
Rank #5/6 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner59.2
Rank #2/6 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
80.6
Rank #5/12 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner84.7
Rank #2/12 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
51.5
Rank #7/33 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner69.8
Rank #2/33 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
24.3
Rank #8/8 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner43.0
Rank #3/8 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
46.9
Rank #33/96 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner56.1
Rank #5/96 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
46.8%
Rank #29/185 · confidence 4
GPT-5.5
winner56.1%
Rank #5/185 · confidence 4
Claude Sonnet 4.6
winner67.4
Rank #9/65 · confidence 3 · eval date 2026-02-01
GPT-5.5
48.7
Rank #48/65 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
32.4
Rank #18/47 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner51.7
Rank #4/47 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
8.3
Rank #19/35 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner35.4
Rank #6/35 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
49.5
Rank #31/56 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner71.3
Rank #14/56 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
79.9
Rank #63/96 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner93.5
Rank #3/96 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
38.0
Rank #29/90 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner56.9
Rank #3/90 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
13.2
Rank #63/96 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner44.3
Rank #5/96 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
35.9
Rank #43/99 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner54.8
Rank #6/99 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
79.7
Rank #17/55 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner83.5
Rank #9/55 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
65.9
Rank #57/90 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner85.5
Rank #24/90 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
winner1314.0
Rank #8/66 · confidence 3 · eval date 2026-02-01
GPT-5.5
1282.0
Rank #20/66 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
70.6
Rank #40/57 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner79.9
Rank #9/57 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
56.5
Rank #25/35 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner70.1
Rank #11/35 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
41.2
Rank #69/86 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner75.9
Rank #16/86 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
65.2
Rank #9/11 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner81.8
Rank #2/11 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
62.9
Rank #8/50 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner72.9
Rank #2/50 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
36.9
Rank #5/20 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner42.7
Rank #3/20 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
72.1
Rank #11/21 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner78.7
Rank #4/21 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
54.8
Rank #30/53 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner85.0
Rank #6/53 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
8.3
Rank #8/11 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner13.0
Rank #7/11 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
59.1
Rank #30/46 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner82.0
Rank #7/46 · confidence 3 · eval date 2026-04-23
Claude Sonnet 4.6
79.5
Rank #55/84 · confidence 3 · eval date 2026-02-01
GPT-5.5
winner93.9
Rank #26/84 · confidence 3 · eval date 2026-04-23
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude Sonnet 4.6 | GPT-5.5 |
|---|---|---|
Winner: GPT-5.5 | Claude Sonnet 4.6 claude-sonnet-4-6 No audit yet | GPT-5.5 gpt-5.5 Audit score 100 100100100100 |
Winner: Claude Sonnet 4.6 | Claude Sonnet 4.6 claude-sonnet-4-6 Audit score 97 10010086100 | GPT-5.5 gpt-5.5 Audit score 87 84 |
Winner: GPT-5.5 | Claude Sonnet 4.6 claude-sonnet-4-6 No audit yet | GPT-5.5 gpt-5.5 Audit score 96 10084100100 |
Winner: Claude Sonnet 4.6 | Claude Sonnet 4.6 claude-sonnet-4-6 Audit score 94 76100100100 | GPT-5.5 gpt-5.5 Audit score 74 72 |
Winner: GPT-5.5 | Claude Sonnet 4.6 claude-sonnet-4-6 No audit yet | GPT-5.5 gpt-5.5 Audit score 93 1008486100 |
Winner: GPT-5.5 | Claude Sonnet 4.6 claude-sonnet-4-6 No audit yet | GPT-5.5 gpt-5.5 Audit score 74 72727279 |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | Claude Sonnet 4.6 | GPT-5.5 |
|---|---|---|
35 tests | Claude Sonnet 4.6 speed / latency N/A / N/A input / output No data | GPT-5.5 speed / latency 38 tok/s / 8937ms input / output No data |
35 tests | Claude Sonnet 4.6 speed / latency 48 tok/s / 1587ms input / output No data | GPT-5.5 speed / latency 52 tok/s / 3050ms input / output No data |
25 tests | Claude Sonnet 4.6 speed / latency N/A / N/A input / output No data | GPT-5.5 speed / latency 38 tok/s / 7849ms input / output No data |
25 tests | Claude Sonnet 4.6 speed / latency 40 tok/s / 3145ms input / output No data | GPT-5.5 speed / latency N/A / N/A input / output No data |
15 tests | Claude Sonnet 4.6 speed / latency 31 tok/s / 4124ms input / output No data | GPT-5.5 speed / latency 52 tok/s / 1870ms input / output No data |
Claude Sonnet 4.6 claude-sonnet-4-6 speed / latency No data input / output $0/M/$0/M | GPT-5.5 gpt-5.5-openai-compact speed / latency No data input / output $0/M | |
Claude Sonnet 4.6 claude-sonnet-4-6 speed / latency No data input / output $0/request | GPT-5.5 gpt-5.5 speed / latency No data input / output $0/request |
Weighted outcome: GPT-5.5. 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 |
|---|
