Data points: 114
Model compare
GPT-5 vs GPT-5.6 Terra
The readout for GPT-5 and GPT-5.6 Terra, before the detailed comparison sheet.
Key Takeaways
Weighted outcome: GPT-5.6 Terra. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.6 Terra
GPT-5.6 Terra has the higher weighted result; Model A / B score 8 to 92.
Evidence depth
114 data points
Includes 24 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5.6 Terra
The charts below split 34 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 and GPT-5.6 Terra: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5 | GPT-5.6 Terra |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 8.0 pts | 92.0 pts |
| Benchmark category leads | 0 categories | 7 categories |
| Operational advantages | Free providers, Provider coverage | Cheapest input price, Average speed, First-token latency |
| Context window | 400K tokens | 1.1M tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input TextImageFile 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 | GPT-5.6 Terra |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Aug 2025 | Jul 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | 2024-09-30 | 2026-02-16 |
| OpenRouter ID | openai/gpt-5 | openai/gpt-5.6-terra |
| References | No data | No data |
When to choose each model
This report only uses LMSpeed data for GPT-5 and GPT-5.6 Terra: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5
GPT-5 has these operational advantages: Free providers, Provider coverage.
GPT-5.6 Terra
GPT-5.6 Terra is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (Cheapest input price, Average speed, First-token latency).
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
- 7 / 8
- Model B coverage
- 7 / 8
- Shared
- 7 shared categories
Avg. score
GPT-5
50.9
Avg. score
GPT-5.6 Terra
57.5
Agents
GPT-5.6 Terra leads by 14.2
Coding
GPT-5.6 Terra leads by 8.9
Reasoning
GPT-5.6 Terra leads by 7.3
Knowledge
GPT-5.6 Terra leads by 6.4
Math
GPT-5.6 Terra leads by 2.2
Multilingual
No data
Multimodal
GPT-5.6 Terra leads by 6.8
Instruction following
GPT-5.6 Terra leads by 0.2
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
67.0
Rank #27/112 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner74.0
Rank #9/112 · confidence 4 · eval date 2026-07-09
GPT-5
winner$1.25/M
Rank #123/186 · confidence 4
GPT-5.6 Terra
$2.00/M
Rank #143/186 · confidence 4
GPT-5
winner$3.44/M
Rank #139/186 · confidence 4
GPT-5.6 Terra
$4.50/M
Rank #152/186 · confidence 4
GPT-5
winner$10.00/M
Rank #142/186 · confidence 4
GPT-5.6 Terra
$12.00/M
Rank #152/186 · confidence 4
GPT-5
76.0
Rank #46/106 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner83.0
Rank #8/106 · confidence 4 · eval date 2026-07-09
GPT-5
winner73.2
Rank #31/67 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
63.7
Rank #44/67 · confidence 4 · eval date 2026-07-09
GPT-5
6.0%
Rank #158/216 · confidence 4
GPT-5.6 Terra
winner11.4%
Rank #115/216 · confidence 4
GPT-5
67.3%
Rank #148/218 · confidence 4
GPT-5.6 Terra
winner74.6%
Rank #126/218 · confidence 4
GPT-5
37.8
Rank #58/75 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner76.7
Rank #6/75 · confidence 4 · eval date 2026-07-09
GPT-5
41.1
Rank #66/113 · confidence 2 · eval date 2025-08-07
GPT-5.6 Terra
winner55.0
Rank #17/113 · confidence 4 · eval date 2026-07-09
GPT-5
22.9
Rank #76/117 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner55.0
Rank #4/117 · confidence 4 · eval date 2026-07-09
GPT-5
25.4
Rank #60/114 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner42.9
Rank #17/114 · confidence 4 · eval date 2026-07-09
GPT-5
84.2
Rank #64/113 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner92.5
Rank #18/113 · confidence 4 · eval date 2026-07-09
GPT-5
39.5
Rank #38/106 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner46.8
Rank #22/106 · confidence 4 · eval date 2026-07-09
GPT-5
65.4
Rank #51/83 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner77.1
Rank #24/83 · confidence 4 · eval date 2026-07-09
GPT-5
83.2
Rank #32/106 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner87.9
Rank #25/106 · confidence 4 · eval date 2026-07-09
GPT-5
74.3
Rank #38/68 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner80.7
Rank #10/68 · confidence 4 · eval date 2026-07-09
GPT-5
69.4
Rank #27/56 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner77.1
Rank #18/56 · confidence 4 · eval date 2026-07-09
GPT-5
86.3
Rank #27/52 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner87.1
Rank #25/52 · confidence 4 · eval date 2026-07-09
GPT-5
70.6
Rank #32/84 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner71.2
Rank #31/84 · confidence 4 · eval date 2026-07-09
GPT-5
1083.0
Rank #45/72 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner1583.0
Rank #13/72 · confidence 4 · eval date 2026-07-09
GPT-5
26.5
Rank #34/70 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner43.7
Rank #16/70 · confidence 4 · eval date 2026-07-09
GPT-5
29.1
Rank #43/66 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
winner48.8
Rank #16/66 · confidence 4 · eval date 2026-07-09
GPT-5
winner86.5
Rank #39/82 · confidence 1 · eval date 2025-08-07
GPT-5.6 Terra
86.3
Rank #40/82 · confidence 4 · 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 | GPT-5.6 Terra |
|---|---|---|
| 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 | GPT-5.6 Terra |
|---|---|---|
V-API20 tests | GPT-5 speed / latency 95 tok/s / 1234ms input / output No data | GPT-5.6 Terra speed / latency N/A / N/A input / output No data |
N1N5 tests | GPT-5 speed / latency 102 tok/s / 948ms input / output No data | GPT-5.6 Terra speed / latency N/A / N/A input / output No data |
简易-API中转站5 tests | GPT-5 speed / latency 58 tok/s / 17419ms input / output No data | GPT-5.6 Terra speed / latency N/A / N/A input / output No data |
10dian-API0 tests | GPT-5 speed / latency N/A / N/A input / output No data | GPT-5.6 Terra speed / latency N/A / N/A input / output No data |
6345ywz API0 tests | GPT-5 speed / latency N/A / N/A input / output No data | GPT-5.6 Terra speed / latency N/A / N/A input / output No data |
GPT-5 gpt-5-2025-08-07 speed / latency No data input / output $0.959/M/$7.67/M | GPT-5.6 Terra gpt-5.6-terra speed / latency No data input / output $0/M/$0/M | |
GPT-5 gpt-5 speed / latency No data input / output $0/M/$0/M | GPT-5.6 Terra gpt-5-6-terra speed / latency No data input / output $0/M/$0/M | |
GPT-5 gpt-5 speed / latency No data input / output $0/request | GPT-5.6 Terra gpt-5.6-terra speed / latency No data input / output $0/request | |
GPT-5 gpt-5 speed / latency No data input / output $0.0014/request | GPT-5.6 Terra gpt-5.6-terra speed / latency No data input / output $0.068/M/$0.411/M | |
GPT-5 gpt-5-low speed / latency No data input / output $0.0068/request | GPT-5.6 Terra gpt-5.6-terra-openai-compact speed / latency No data input / output $0.171/M/$1.03/M |
FAQ
Weighted outcome: GPT-5.6 Terra. 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.