Data points: 154
Model compare
The readout for Claude Opus 4.8 and GPT-5.1, before the detailed comparison sheet.
Weighted outcome: Claude Opus 4.8. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
Claude Opus 4.8
Claude Opus 4.8 has the higher weighted result; Model A / B score 72 to 28.
Evidence depth
154 data points
Includes 35 benchmark rows, 4 audit samples, and 7 provider examples.
Selection signal
Start with Claude Opus 4.8
The charts below split 46 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 4.8 and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Claude Opus 4.8 | GPT-5.1 |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 72.0 pts | 28.0 pts |
| Benchmark category leads | 6 categories | 2 categories |
| Operational advantages | Cheapest input price, Average speed, First-token latency | Free providers, Provider coverage |
| Context window | 1M tokens | 400K 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 4.8 | GPT-5.1 |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Released | May 2026 | Nov 2025 |
| Parameters | No data | No data |
| Tokenizer | Claude | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | anthropic/claude-opus-4.8 | openai/gpt-5.1 |
| References | No data | No data |
This report only uses LMSpeed data for Claude Opus 4.8 and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Claude Opus 4.8
Claude Opus 4.8 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (Cheapest input price, Average speed, First-token latency).
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Multimodal, Instruction following) and operational dimensions (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 Opus 4.8
60.8
Avg. score
GPT-5.1
55.5
Claude Opus 4.8 leads by 15.1
Claude Opus 4.8 leads by 14.3
Claude Opus 4.8 leads by 7.6
Claude Opus 4.8 leads by 6.2
Claude Opus 4.8 leads by 4.0
Claude Opus 4.8 leads by 3.4
GPT-5.1 leads by 4.9
GPT-5.1 leads by 3.8
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Claude Opus 4.8
winner84.0
Rank #6/127 · confidence 3 · eval date 2026-05-28
GPT-5.1
71.0
Rank #29/127 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
57.4 tok/s
Rank #102/139 · confidence 4
GPT-5.1
winner91.8 tok/s
Rank #69/139 · confidence 4
Claude Opus 4.8
winner23.67 s
Rank #96/139 · confidence 4
GPT-5.1
34.52 s
Rank #111/139 · confidence 4
Claude Opus 4.8
winner23.67 s
Rank #126/139 · confidence 4
GPT-5.1
34.52 s
Rank #129/139 · confidence 4
Claude Opus 4.8
$5.00/M
Rank #147/163 · confidence 4
GPT-5.1
winner$1.25/M
Rank #109/163 · confidence 4
Claude Opus 4.8
$10.00/M
Rank #148/163 · confidence 4
GPT-5.1
winner$3.44/M
Rank #119/163 · confidence 4
Claude Opus 4.8
$25.00/M
Rank #148/163 · confidence 4
GPT-5.1
winner$10.00/M
Rank #122/163 · confidence 4
Claude Opus 4.8
67.7
Rank #28/89 · confidence 3 · eval date 2026-05-28
GPT-5.1
winner75.0
Rank #3/89 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner45.7%
Rank #5/186 · confidence 4
GPT-5.1
26.5%
Rank #39/186 · confidence 4
Claude Opus 4.8
winner20.9
Rank #8/73 · confidence 3 · eval date 2026-05-28
GPT-5.1
4.9
Rank #34/73 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner92.0%
Rank #10/187 · confidence 4
GPT-5.1
87.3%
Rank #32/187 · confidence 4
Claude Opus 4.8
winner58.3
Rank #4/85 · confidence 3 · eval date 2026-05-28
GPT-5.1
45.5
Rank #19/85 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner74.3
Rank #5/58 · confidence 3 · eval date 2026-05-28
GPT-5.1
49.4
Rank #32/58 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner87.3
Rank #5/100 · confidence 3 · eval date 2026-05-28
GPT-5.1
64.5
Rank #52/100 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner53.5%
Rank #9/184 · confidence 4
GPT-5.1
43.3%
Rank #41/184 · confidence 4
Claude Opus 4.8
winner53.5
Rank #12/96 · confidence 3 · eval date 2026-05-28
GPT-5.1
43.3
Rank #45/96 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner31.3
Rank #7/35 · confidence 3 · eval date 2026-05-28
GPT-5.1
12.5
Rank #16/35 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner47.2
Rank #8/47 · confidence 3 · eval date 2026-05-28
GPT-5.1
31.0
Rank #19/47 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner73.6
Rank #10/59 · confidence 3 · eval date 2026-05-28
GPT-5.1
47.5
Rank #35/59 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner45.7
Rank #3/96 · confidence 3 · eval date 2026-05-28
GPT-5.1
26.5
Rank #39/96 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner27.4
Rank #3/29 · confidence 3 · eval date 2026-05-28
GPT-5.1
5.6
Rank #19/29 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner55.7
Rank #3/99 · confidence 3 · eval date 2026-05-28
GPT-5.1
36.9
Rank #42/99 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner88.0
Rank #7/92 · confidence 3 · eval date 2026-05-28
GPT-5.1
76.9
Rank #22/92 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner92.0
Rank #10/96 · confidence 3 · eval date 2026-05-28
GPT-5.1
87.3
Rank #36/96 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner46.6
Rank #11/90 · confidence 3 · eval date 2026-05-28
GPT-5.1
37.6
Rank #31/90 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
35.9
Rank #78/90 · confidence 3 · eval date 2026-05-28
GPT-5.1
winner51.3
Rank #66/90 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
66.5
Rank #34/81 · confidence 3 · eval date 2026-05-28
GPT-5.1
winner92.0
Rank #1/81 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner1274.0
Rank #25/65 · confidence 3 · eval date 2026-05-28
GPT-5.1
1222.0
Rank #37/65 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
62.2
Rank #51/86 · confidence 3 · eval date 2026-05-28
GPT-5.1
winner72.9
Rank #30/86 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner73.0
Rank #1/50 · confidence 3 · eval date 2026-05-28
GPT-5.1
41.2
Rank #35/50 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner47.2
Rank #4/54 · confidence 3 · eval date 2026-05-28
GPT-5.1
21.0
Rank #36/54 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner1600.0
Rank #4/54 · confidence 3 · eval date 2026-05-28
GPT-5.1
987.0
Rank #35/54 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner55.0
Rank #4/50 · confidence 3 · eval date 2026-05-28
GPT-5.1
24.4
Rank #35/50 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner92.9
Rank #6/95 · confidence 3 · eval date 2026-05-28
GPT-5.1
70.1
Rank #30/95 · confidence 1 · eval date 2025-11-13
Claude Opus 4.8
winner94.4
Rank #22/84 · confidence 3 · eval date 2026-05-28
GPT-5.1
81.9
Rank #52/84 · confidence 1 · eval date 2025-11-13
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude Opus 4.8 | GPT-5.1 |
|---|---|---|
Winner: Claude Opus 4.8 | Claude Opus 4.8 claude-opus-4-8 Audit score 100 100100100100 | GPT-5.1 gpt-5.1-chat-latest No audit yet |
Winner: Claude Opus 4.8 | Claude Opus 4.8 claude-opus-4-8 Audit score 91 7610086100 | GPT-5.1 gpt-5.1 No audit yet |
Winner: Claude Opus 4.8 | Claude Opus 4.8 claude-opus-4-8 Audit score 83 668480100 | GPT-5.1 gpt-5.1-chat-latest No audit yet |
Winner: Claude Opus 4.8 | Claude Opus 4.8 claude-opus-4-8 Audit score 78 70728088 | GPT-5.1 gpt-5.1 No audit yet |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | Claude Opus 4.8 | GPT-5.1 |
|---|---|---|
15 tests | Claude Opus 4.8 speed / latency 50 tok/s / 4823ms input / output No data | GPT-5.1 speed / latency 137 tok/s / 3299ms input / output No data |
10 tests | Claude Opus 4.8 speed / latency 43 tok/s / 2368ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
0 tests | Claude Opus 4.8 speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
0 tests | Claude Opus 4.8 speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
0 tests | Claude Opus 4.8 speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
Claude Opus 4.8 claude-opus-4.8 speed / latency No data input / output $2.50/M/$12.50/M | GPT-5.1 gpt-5.1 speed / latency No data input / output $0/request | |
Claude Opus 4.8 claude-opus-4-8 speed / latency No data input / output $0/request | GPT-5.1 gpt-5.1-chat-latest speed / latency No data input / output $0/request |
Weighted outcome: Claude Opus 4.8. 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 |
|---|
