Data points: 82
Model compare
The readout for Claude Opus 4.1 and Claude Sonnet 4.5, before the detailed comparison sheet.
Weighted outcome: Claude Sonnet 4.5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
Claude Sonnet 4.5
Claude Sonnet 4.5 has the higher weighted result; Model A / B score 34.7 to 65.3.
Evidence depth
82 data points
Includes 8 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Start with Claude Sonnet 4.5
The charts below split 15 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 4.1 and Claude Sonnet 4.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Claude Opus 4.1 | Claude Sonnet 4.5 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 34.7 pts | 65.3 pts |
| Benchmark category leads | 1 categories | 2 categories |
| Operational advantages | First-token latency, Free providers | Cheapest input price, Average speed, Provider coverage |
| Context window | 200K tokens | 1M tokens |
| Max output | 32K tokens | 64K tokens |
| Modalities | Input ImageTextFile 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 4.1 | Claude Sonnet 4.5 |
|---|---|---|
| Developer | Anthropic | Anthropic |
| Released | Aug 2025 | Sep 2025 |
| Parameters | No data | No data |
| Tokenizer | Claude | Claude |
| Knowledge cutoff | 2025-01-31 | 2025-01-31 |
| OpenRouter ID | anthropic/claude-opus-4.1 | anthropic/claude-sonnet-4.5 |
| References | No data | No data |
This report only uses LMSpeed data for Claude Opus 4.1 and Claude Sonnet 4.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Claude Opus 4.1
Claude Opus 4.1 is stronger in benchmark categories (Knowledge) and operational dimensions (First-token latency, Free providers).
Claude Sonnet 4.5
Claude Sonnet 4.5 is stronger in benchmark categories (Agents, Coding) and operational dimensions (Cheapest input price, Average speed, 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 Opus 4.1
51.4
Avg. score
Claude Sonnet 4.5
48.3
Claude Sonnet 4.5 leads by 0.2
Claude Sonnet 4.5 leads by 4.9
Claude Sonnet 4.5
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Claude Opus 4.1
winner57.0
Rank #38/84 · confidence 1 · eval date 2025-08-01
Claude Sonnet 4.5
47.0
Rank #64/84 · confidence 2 · eval date 2025-09-01
Claude Opus 4.1
$75.00/M
Rank #157/162 · confidence 4
Claude Sonnet 4.5
winner$15.00/M
Rank #136/162 · confidence 4
Claude Opus 4.1
$30.00/M
Rank #156/162 · confidence 4
Claude Sonnet 4.5
winner$6.00/M
Rank #137/162 · confidence 4
Claude Opus 4.1
$15.00/M
Rank #155/162 · confidence 4
Claude Sonnet 4.5
winner$3.00/M
Rank #137/162 · confidence 4
Claude Opus 4.1
74.5
Rank #27/43 · confidence 1 · eval date 2025-08-01
Claude Sonnet 4.5
winner77.2
Rank #20/43 · confidence 2 · eval date 2025-09-01
Claude Opus 4.1
50.9
Rank #38/65 · confidence 1 · eval date 2025-08-01
Claude Sonnet 4.5
winner54.7
Rank #28/65 · confidence 2 · eval date 2025-09-01
Claude Opus 4.1
1207.0
Rank #42/66 · confidence 1 · eval date 2025-08-01
Claude Sonnet 4.5
winner1219.0
Rank #38/66 · confidence 2 · eval date 2025-09-01
Claude Opus 4.1
21.9
Rank #13/20 · confidence 1 · eval date 2025-08-01
Claude Sonnet 4.5
winner27.7
Rank #10/20 · confidence 2 · eval date 2025-09-01
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude Opus 4.1 | Claude Sonnet 4.5 |
|---|---|---|
| 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 4.1 | Claude Sonnet 4.5 |
|---|---|---|
15 tests | Claude Opus 4.1 speed / latency N/A / N/A input / output No data | Claude Sonnet 4.5 speed / latency 46 tok/s / 5111ms input / output No data |
10 tests | Claude Opus 4.1 speed / latency N/A / N/A input / output No data | Claude Sonnet 4.5 speed / latency 41 tok/s / 3271ms input / output No data |
10 tests | Claude Opus 4.1 speed / latency N/A / N/A input / output No data | Claude Sonnet 4.5 speed / latency 45 tok/s / 3170ms input / output No data |
5 tests | Claude Opus 4.1 speed / latency N/A / N/A input / output No data | Claude Sonnet 4.5 speed / latency 29 tok/s / 9801ms input / output No data |
5 tests | Claude Opus 4.1 speed / latency 17 tok/s / 3847ms input / output No data | Claude Sonnet 4.5 speed / latency N/A / N/A input / output No data |
Claude Opus 4.1 claude-opus-4-1-20250805 speed / latency No data input / output $0/M/$0/M | Claude Sonnet 4.5 claude-sonnet-4-5 speed / latency No data input / output $0.247/M | |
Claude Opus 4.1 claude-opus-4-1 speed / latency No data input / output $0/request | Claude Sonnet 4.5 claude-sonnet-4-5 speed / latency No data input / output $0/request |
Weighted outcome: Claude Sonnet 4.5. 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 |
|---|
Claude Opus 4.1 leads by 5.8
Claude Sonnet 4.5
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