Data points: 61
Model compare
The readout for Claude 2.1 and Claude Sonnet 4, before the detailed comparison sheet.
Weighted outcome: Claude Sonnet 4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
Claude Sonnet 4
Claude Sonnet 4 has the higher weighted result; Model A / B score 0 to 100.
Evidence depth
61 data points
Includes 7 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Start with Claude Sonnet 4
The charts below split 14 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 2.1 and Claude Sonnet 4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Claude 2.1 | Claude Sonnet 4 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 0.0 pts | 100.0 pts |
| Benchmark category leads | 0 categories | 3 categories |
| Operational advantages | No data | Cheapest input price, Free providers, Provider coverage |
| Context window | No data | 1M tokens |
| Max output | No data | 64K tokens |
| Modalities | No data | 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 2.1 | Claude Sonnet 4 |
|---|---|---|
| Developer | Anthropic | Anthropic |
| Released | No data | May 2025 |
| Parameters | No data | No data |
| Tokenizer | No data | Claude |
| Knowledge cutoff | No data | 2025-01-31 |
| OpenRouter ID | No data | anthropic/claude-sonnet-4 |
| References | No data | No data |
This report only uses LMSpeed data for Claude 2.1 and Claude Sonnet 4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Claude 2.1
Claude 2.1 does not clearly lead in the benchmark or operational dimensions shared by both models.
Claude Sonnet 4
Claude Sonnet 4 is stronger in benchmark categories (Coding, Reasoning, Math) 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 2.1
36
Avg. score
Claude Sonnet 4
48
Claude Sonnet 4
Claude Sonnet 4 leads by 12.8
Claude Sonnet 4 leads by 12.7
Claude Sonnet 4
Claude Sonnet 4 leads by 14.7
No data
No data
Claude Sonnet 4
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Claude 2.1
49.5%
Rank #120/125 · confidence 4
Claude Sonnet 4
winner83.7%
Rank #32/125 · confidence 4
Claude 2.1
31.9%
Rank #184/187 · confidence 4
Claude Sonnet 4
winner68.3%
Rank #117/187 · confidence 4
Claude 2.1
winner4.2%
Rank #153/186 · confidence 4
Claude Sonnet 4
4.0%
Rank #161/186 · confidence 4
Claude 2.1
19.5%
Rank #104/115 · confidence 4
Claude Sonnet 4
winner44.9%
Rank #66/115 · confidence 4
Claude 2.1
18.4%
Rank #177/184 · confidence 4
Claude Sonnet 4
winner37.3%
Rank #93/184 · confidence 4
Claude 2.1
37.4%
Rank #72/72 · confidence 4
Claude Sonnet 4
winner93.4%
Rank #26/72 · confidence 4
Claude 2.1
3.3%
Rank #62/68 · confidence 4
Claude Sonnet 4
winner40.7%
Rank #33/68 · confidence 4
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude 2.1 | Claude Sonnet 4 |
|---|---|---|
| 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 2.1 | Claude Sonnet 4 |
|---|---|---|
0 tests | Claude 2.1 speed / latency N/A / N/A input / output No data | Claude Sonnet 4 speed / latency N/A / N/A input / output No data |
0 tests | Claude 2.1 speed / latency N/A / N/A input / output No data | Claude Sonnet 4 speed / latency N/A / N/A input / output No data |
0 tests | Claude 2.1 speed / latency N/A / N/A input / output No data | Claude Sonnet 4 speed / latency N/A / N/A input / output No data |
0 tests | Claude 2.1 claude-2.1 speed / latency N/A / N/A input / output $8.00/M/$24.00/M | Claude Sonnet 4 claude-4-sonnet speed / latency N/A / N/A input / output $75.00/M |
0 tests | Claude 2.1 speed / latency N/A / N/A input / output No data | Claude Sonnet 4 speed / latency N/A / N/A input / output No data |
Claude 2.1 claude-2.1 speed / latency No data input / output $0/request | Claude Sonnet 4 claude-sonnet-4-20250514 speed / latency No data input / output $0/request | |
Claude 2.1 claude-2.1 speed / latency No data input / output $9.60/M/$28.80/M | Claude Sonnet 4 claude-sonnet-4-20250514 speed / latency No data input / output $3.60/M |
Weighted outcome: Claude Sonnet 4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
| Features | None listed | Text inputImage inputFile inputText outputTool callingReasoning |
|---|
