Data points: 83
Model compare
The readout for Claude Opus 4.6 and GPT-5.5 Pro, before the detailed comparison sheet.
Weighted outcome: GPT-5.5 Pro. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.5 Pro
GPT-5.5 Pro has the higher weighted result; Model A / B score 20 to 80.
Evidence depth
83 data points
Includes 10 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Start with GPT-5.5 Pro
The charts below split 17 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 Opus 4.6 and GPT-5.5 Pro: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Claude Opus 4.6 | GPT-5.5 Pro |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 20.0 pts | 80.0 pts |
| Benchmark category leads | 0 categories | 4 categories |
| Operational advantages | Cheapest input price, Free providers, Provider coverage | No data |
| 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 Opus 4.6 | GPT-5.5 Pro |
|---|---|---|
| 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-opus-4.6 | openai/gpt-5.5-pro |
| References | No data | No data |
This report only uses LMSpeed data for Claude Opus 4.6 and GPT-5.5 Pro: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Claude Opus 4.6
Claude Opus 4.6 has these operational advantages: Cheapest input price, Free providers, Provider coverage.
GPT-5.5 Pro
GPT-5.5 Pro leads these benchmark categories: Agents, Reasoning, Knowledge, Math.
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 Opus 4.6
53.3
Avg. score
GPT-5.5 Pro
60.7
GPT-5.5 Pro leads by 6.0
Claude Opus 4.6
GPT-5.5 Pro leads by 9.4
GPT-5.5 Pro leads by 7.3
GPT-5.5 Pro leads by 0.7
Claude Opus 4.6
Claude Opus 4.6
Claude Opus 4.6
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Claude Opus 4.6
67.0
Rank #21/93 · confidence 3 · eval date 2026-02-01
GPT-5.5 Pro
winner76.0
Rank #10/93 · confidence 1 · eval date 2026-04-23
Claude Opus 4.6
2.8
Rank #48/78 · confidence 3 · eval date 2026-02-01
GPT-5.5 Pro
winner30.6
Rank #2/78 · confidence 1 · eval date 2026-04-23
Claude Opus 4.6
19.1%
Rank #74/199 · confidence 4
GPT-5.5 Pro
winner57.2%
Rank #2/199 · confidence 1 · eval date 2026-04-23
Claude Opus 4.6
22.9
Rank #10/35 · confidence 3 · eval date 2026-02-01
GPT-5.5 Pro
winner39.6
Rank #4/35 · confidence 1 · eval date 2026-04-23
Claude Opus 4.6
40.7
Rank #10/47 · confidence 3 · eval date 2026-02-01
GPT-5.5 Pro
winner51.0
Rank #5/47 · confidence 1 · eval date 2026-04-23
Claude Opus 4.6
59.8
Rank #25/59 · confidence 3 · eval date 2026-02-01
GPT-5.5 Pro
winner72.1
Rank #15/59 · confidence 1 · eval date 2026-04-23
Claude Opus 4.6
82.7
Rank #10/64 · confidence 3 · eval date 2026-02-01
GPT-5.5 Pro
winner85.6
Rank #6/64 · confidence 1 · eval date 2026-04-23
Claude Opus 4.6
40.0
Rank #13/20 · confidence 3 · eval date 2026-02-01
GPT-5.5 Pro
winner43.1
Rank #9/20 · confidence 1 · eval date 2026-04-23
Claude Opus 4.6
83.7
Rank #10/29 · confidence 3 · eval date 2026-02-01
GPT-5.5 Pro
winner90.1
Rank #4/29 · confidence 1 · eval date 2026-04-23
Claude Opus 4.6
65.3
Rank #26/62 · confidence 3 · eval date 2026-02-01
GPT-5.5 Pro
winner83.2
Rank #12/62 · confidence 1 · eval date 2026-04-23
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude Opus 4.6 | GPT-5.5 Pro |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | Claude Opus 4.6 | GPT-5.5 Pro |
|---|---|---|
5 tests | Claude Opus 4.6 speed / latency 46 tok/s / 2559ms input / output No data | GPT-5.5 Pro speed / latency N/A / N/A input / output No data |
5 tests | Claude Opus 4.6 speed / latency 44 tok/s / 2803ms input / output No data | GPT-5.5 Pro speed / latency N/A / N/A input / output No data |
5 tests | Claude Opus 4.6 speed / latency 45 tok/s / 2276ms input / output No data | GPT-5.5 Pro speed / latency N/A / N/A input / output No data |
0 tests | Claude Opus 4.6 speed / latency N/A / N/A input / output No data | GPT-5.5 Pro speed / latency N/A / N/A input / output No data |
0 tests | Claude Opus 4.6 speed / latency N/A / N/A input / output No data | GPT-5.5 Pro speed / latency N/A / N/A input / output No data |
Claude Opus 4.6 claude-opus-4-6 speed / latency No data input / output $0/request | GPT-5.5 Pro gpt-5.5-pro speed / latency No data input / output $0/request | |
Claude Opus 4.6 claude-opus-4-6-c speed / latency No data input / output $0.0082/request | GPT-5.5 Pro gpt-5.5-pro speed / latency No data input / output $69.86/M |
Weighted outcome: GPT-5.5 Pro. 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 |
|---|
