Data points: 111
Model compare
GPT-5.1 vs GPT-5.6 Luna
The readout for GPT-5.1 and GPT-5.6 Luna, before the detailed comparison sheet.
Key Takeaways
Weighted outcome: GPT-5.6 Luna. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.6 Luna
GPT-5.6 Luna has the higher weighted result; Model A / B score 12 to 88.
Evidence depth
111 data points
Includes 23 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5.6 Luna
The charts below split 33 high-signal samples across speed, scores, and audit health.
Change comparison
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.
Comparison sheet
This report only uses LMSpeed data for GPT-5.1 and GPT-5.6 Luna: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 | GPT-5.6 Luna |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 12.0 pts | 88.0 pts |
| Benchmark category leads | 0 categories | 5 categories |
| Operational advantages | First-token latency, Free providers, Provider coverage | Cheapest input price, Average speed |
| Context window | 400K tokens | 1.1M tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input ImageTextFile Output Text | Input FileImageText Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
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 metadata
Model metadata
| Model compare | GPT-5.1 | GPT-5.6 Luna |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Nov 2025 | Jul 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | 2026-02-16 |
| OpenRouter ID | openai/gpt-5.1 | openai/gpt-5.6-luna |
| References | No data | No data |
When to choose each model
This report only uses LMSpeed data for GPT-5.1 and GPT-5.6 Luna: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.1
GPT-5.1 has these operational advantages: First-token latency, Free providers, Provider coverage.
GPT-5.6 Luna
GPT-5.6 Luna is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (Cheapest input price, Average speed).
Benchmark score comparison
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Category performance
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
- Model A coverage
- 6 / 8
- Model B coverage
- 6 / 8
- Shared
- 5 shared categories
Avg. score
GPT-5.1
51.9
Avg. score
GPT-5.6 Luna
56.5
Agents
GPT-5.6 Luna leads by 10.6
Coding
GPT-5.6 Luna leads by 7.6
Reasoning
GPT-5.6 Luna leads by 0.5
Knowledge
GPT-5.6 Luna leads by 3.5
Math
GPT-5.6 Luna leads by 8.4
Multilingual
No data
Multimodal
GPT-5.6 Luna
Instruction following
GPT-5.1
Professional benchmark details
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Professional benchmark details
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.1
56.0
Rank #56/100 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner70.0
Rank #19/100 · confidence 3 · eval date 2026-07-09
GPT-5.1
$1.25/M
Rank #118/179 · confidence 4
GPT-5.6 Luna
winner$0.200/M
Rank #32/179 · confidence 4
GPT-5.1
$3.44/M
Rank #134/179 · confidence 4
GPT-5.6 Luna
winner$0.450/M
Rank #42/179 · confidence 4
GPT-5.1
$10.00/M
Rank #137/179 · confidence 4
GPT-5.6 Luna
winner$1.20/M
Rank #48/179 · confidence 4
GPT-5.1
4.9
Rank #43/83 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner20.6
Rank #12/83 · confidence 3 · eval date 2026-07-09
GPT-5.1
76.7
Rank #19/100 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner78.3
Rank #13/100 · confidence 3 · eval date 2026-07-09
GPT-5.1
87.3%
Rank #47/211 · confidence 4
GPT-5.6 Luna
winner91.1%
Rank #21/211 · confidence 4
GPT-5.1
28.5%
Rank #55/208 · confidence 4
GPT-5.6 Luna
winner39.5%
Rank #27/208 · confidence 4
GPT-5.1
49.4
Rank #42/70 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner71.5
Rank #15/70 · confidence 3 · eval date 2026-07-09
GPT-5.1
43.3%
Rank #55/204 · confidence 4
GPT-5.6 Luna
winner52.5%
Rank #21/204 · confidence 4
GPT-5.1
43.3
Rank #55/108 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner52.5
Rank #24/108 · confidence 3 · eval date 2026-07-09
GPT-5.1
49.7
Rank #36/62 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner96.9
Rank #1/62 · confidence 3 · eval date 2026-07-09
GPT-5.1
12.5
Rank #16/35 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner58.5
Rank #3/35 · confidence 3 · eval date 2026-07-09
GPT-5.1
31.0
Rank #19/47 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner78.6
Rank #3/47 · confidence 3 · eval date 2026-07-09
GPT-5.1
51.9
Rank #72/101 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner92.6
Rank #10/101 · confidence 3 · eval date 2026-07-09
GPT-5.1
87.3
Rank #44/108 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner91.1
Rank #21/108 · confidence 3 · eval date 2026-07-09
GPT-5.1
37.5
Rank #52/111 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner51.2
Rank #21/111 · confidence 3 · eval date 2026-07-09
GPT-5.1
28.5
Rank #47/108 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner39.5
Rank #25/108 · confidence 3 · eval date 2026-07-09
GPT-5.1
37.7
Rank #39/101 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner42.7
Rank #25/101 · confidence 3 · eval date 2026-07-09
GPT-5.1
75.5
Rank #28/65 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner78.6
Rank #17/65 · confidence 3 · eval date 2026-07-09
GPT-5.1
24.6
Rank #46/61 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner53.9
Rank #11/61 · confidence 3 · eval date 2026-07-09
GPT-5.1
993.0
Rank #46/66 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner1582.0
Rank #11/66 · confidence 3 · eval date 2026-07-09
GPT-5.1
21.6
Rank #47/65 · confidence 1 · eval date 2025-11-13
GPT-5.6 Luna
winner46.9
Rank #15/65 · confidence 3 · eval date 2026-07-09
API audit comparison
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
API audit comparison
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.1 | GPT-5.6 Luna |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Provider examples
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
Provider examples
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-5.1 | GPT-5.6 Luna |
|---|---|---|
BUZZ10 tests | GPT-5.1 speed / latency 137 tok/s / 3299ms input / output No data | GPT-5.6 Luna speed / latency N/A / N/A input / output No data |
OpenCode10 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | GPT-5.6 Luna speed / latency 2042 tok/s / 2791ms input / output No data |
N1N5 tests | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data | GPT-5.6 Luna speed / latency N/A / N/A input / output No data |
XShuLab Sub2API5 tests | GPT-5.1 speed / latency 152 tok/s / 936ms input / output No data | GPT-5.6 Luna speed / latency N/A / N/A input / output No data |
6345ywz API0 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | GPT-5.6 Luna speed / latency N/A / N/A input / output No data |
GPT-5.1 gpt-5.1-2025-11-13 speed / latency No data input / output $0.959/M/$7.67/M | GPT-5.6 Luna gpt-5.6-luna speed / latency No data input / output $0/M/$0/M | |
GPT-5.1 gpt-5.1-chat-latest speed / latency No data input / output $0/request | GPT-5.6 Luna gpt-5.6-luna speed / latency No data input / output $0/request | |
GPT-5.1 gpt-5.1 speed / latency No data input / output $0.0027/request | GPT-5.6 Luna gpt-5.6-luna speed / latency No data input / output $0.034/M/$0.205/M | |
GPT-5.1 gpt-5.1 speed / latency No data input / output $0.0068/request | GPT-5.6 Luna gpt-5.6-luna speed / latency No data input / output $0.014/M/$0.082/M | |
GPT-5.1 gpt-5.1 speed / latency No data input / output $0.103/M/$0.822/M | GPT-5.6 Luna gpt-5.6-luna speed / latency No data input / output $0.010/M/$0.062/M |
FAQ
Weighted outcome: GPT-5.6 Luna. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
- Why is this comparison indexable?
- It has 6 verifiable comparison points, and both models have pricing or benchmark data.
- Are missing metrics invented?
- No. Metrics without LMSpeed data are omitted from this report.