Data points: 157
Model compare
GPT-5.4 vs GPT-5.6 Terra
The readout for GPT-5.4 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 42.3 to 57.7.
Evidence depth
157 data points
Includes 46 benchmark rows, 0 audit samples, and 9 provider examples.
Selection signal
Start with GPT-5.6 Terra
The charts below split 55 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-5.4 and GPT-5.6 Terra: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.4 | GPT-5.6 Terra |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 42.3 pts | 57.7 pts |
| Benchmark category leads | 3 categories | 4 categories |
| Operational advantages | Free providers, Provider coverage | Cheapest input price, Average speed, First-token latency |
| Context window | 1.1M 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-5.4 | GPT-5.6 Terra |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Mar 2026 | Jul 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | 2026-02-16 |
| OpenRouter ID | openai/gpt-5.4 | openai/gpt-5.6-terra |
| References | No data | No data |
When to choose each model
This report only uses LMSpeed data for GPT-5.4 and GPT-5.6 Terra: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.4
GPT-5.4 is stronger in benchmark categories (Coding, Knowledge, Instruction following) and operational dimensions (Free providers, Provider coverage).
GPT-5.6 Terra
GPT-5.6 Terra is stronger in benchmark categories (Agents, Reasoning, Math, Multimodal) 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-5.4
57.2
Avg. score
GPT-5.6 Terra
58.5
Agents
GPT-5.6 Terra leads by 5.6
Coding
GPT-5.4 leads by 3.5
Reasoning
GPT-5.6 Terra leads by 2.6
Knowledge
GPT-5.4 leads by 2.9
Math
GPT-5.6 Terra leads by 6.9
Multilingual
No data
Multimodal
GPT-5.6 Terra leads by 1.8
Instruction following
GPT-5.4 leads by 1.0
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-5.4
66.0
Rank #28/100 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner78.0
Rank #8/100 · confidence 3 · eval date 2026-07-09
GPT-5.4
$2.50/M
Rank #149/179 · confidence 4
GPT-5.6 Terra
winner$2.00/M
Rank #138/179 · confidence 4
GPT-5.4
$5.63/M
Rank #153/179 · confidence 4
GPT-5.6 Terra
winner$4.50/M
Rank #147/179 · confidence 4
GPT-5.4
$15.00/M
Rank #154/179 · confidence 4
GPT-5.6 Terra
winner$12.00/M
Rank #147/179 · confidence 4
GPT-5.4
23.4
Rank #8/83 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner30.0
Rank #3/83 · confidence 3 · eval date 2026-07-09
GPT-5.4
74.0
Rank #8/17 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner83.9
Rank #4/17 · confidence 3 · eval date 2026-07-09
GPT-5.4
0.2
Rank #8/11 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner0.8
Rank #4/11 · confidence 3 · eval date 2026-07-09
GPT-5.4
77.7
Rank #15/100 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner79.7
Rank #7/100 · confidence 3 · eval date 2026-07-09
GPT-5.4
73.2
Rank #17/29 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner83.8
Rank #8/29 · confidence 3 · eval date 2026-07-09
GPT-5.4
11.3%
Rank #109/208 · confidence 4
GPT-5.6 Terra
winner11.4%
Rank #108/208 · confidence 4
GPT-5.4
winner74.8%
Rank #116/211 · confidence 4
GPT-5.6 Terra
74.6%
Rank #120/211 · confidence 4
GPT-5.4
71.0
Rank #17/70 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner76.7
Rank #4/70 · confidence 3 · eval date 2026-07-09
GPT-5.4
winner56.6
Rank #6/108 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
53.9
Rank #15/108 · confidence 3 · eval date 2026-07-09
GPT-5.4
57.7
Rank #20/49 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner63.4
Rank #8/49 · confidence 3 · eval date 2026-07-09
GPT-5.4
winner38.5
Rank #9/25 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
30.8
Rank #13/25 · confidence 3 · eval date 2026-07-09
GPT-5.4
46.4
Rank #65/81 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner58.3
Rank #32/81 · confidence 3 · eval date 2026-07-09
GPT-5.4
winner47.1%
Rank #34/204 · confidence 4
GPT-5.6 Terra
44.6%
Rank #49/204 · confidence 4
GPT-5.4
65.7
Rank #23/62 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner96.9
Rank #1/62 · confidence 3 · eval date 2026-07-09
GPT-5.4
27.1
Rank #8/35 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner68.3
Rank #2/35 · confidence 3 · eval date 2026-07-09
GPT-5.4
47.6
Rank #7/47 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner84.9
Rank #2/47 · confidence 3 · eval date 2026-07-09
GPT-5.4
winner40.1
Rank #1/7 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
32.7
Rank #3/7 · confidence 3 · eval date 2026-07-09
GPT-5.4
48.1
Rank #6/6 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner57.7
Rank #4/6 · confidence 3 · eval date 2026-07-09
GPT-5.4
92.8
Rank #8/31 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner92.9
Rank #7/31 · confidence 3 · eval date 2026-07-09
GPT-5.4
winner43.7
Rank #11/108 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
42.9
Rank #13/108 · confidence 3 · eval date 2026-07-09
GPT-5.4
winner50.8
Rank #12/101 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
46.8
Rank #19/101 · confidence 3 · eval date 2026-07-09
GPT-5.4
77.3
Rank #19/69 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner82.2
Rank #12/69 · confidence 3 · eval date 2026-07-09
GPT-5.4
winner91.7
Rank #13/101 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
87.9
Rank #26/101 · confidence 3 · eval date 2026-07-09
GPT-5.4
92.0
Rank #17/108 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner92.5
Rank #14/108 · confidence 3 · eval date 2026-07-09
GPT-5.4
53.1
Rank #17/111 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner55.0
Rank #14/111 · confidence 3 · eval date 2026-07-09
GPT-5.4
winner5.8
Rank #23/40 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
0.1
Rank #40/40 · confidence 3 · eval date 2026-07-09
GPT-5.4
winner82.1
Rank #4/9 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
82.0
Rank #5/9 · confidence 3 · eval date 2026-07-09
GPT-5.4
winner81.2
Rank #7/31 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
80.7
Rank #10/31 · confidence 3 · eval date 2026-07-09
GPT-5.4
78.4
Rank #21/65 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner80.7
Rank #8/65 · confidence 3 · eval date 2026-07-09
GPT-5.4
67.3
Rank #19/44 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner75.3
Rank #12/44 · confidence 3 · eval date 2026-07-09
GPT-5.4
winner73.9
Rank #22/84 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
71.2
Rank #33/84 · confidence 3 · eval date 2026-07-09
GPT-5.4
6.0
Rank #5/6 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner23.2
Rank #2/6 · confidence 3 · eval date 2026-07-09
GPT-5.4
winner98.9
Rank #2/82 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
86.3
Rank #40/82 · confidence 3 · eval date 2026-07-09
GPT-5.4
33.3
Rank #7/23 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner38.9
Rank #3/23 · confidence 3 · eval date 2026-07-09
GPT-5.4
79.0
Rank #6/15 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner81.8
Rank #3/15 · confidence 3 · eval date 2026-07-09
GPT-5.4
75.1
Rank #13/53 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner87.4
Rank #3/53 · confidence 3 · eval date 2026-07-09
GPT-5.4
74.8
Rank #22/69 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner91.6
Rank #4/69 · confidence 3 · eval date 2026-07-09
GPT-5.4
82.7
Rank #15/31 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner87.5
Rank #6/31 · confidence 3 · eval date 2026-07-09
GPT-5.4
winner54.6
Rank #6/24 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
53.1
Rank #8/24 · confidence 3 · eval date 2026-07-09
GPT-5.4
44.2
Rank #19/65 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner50.2
Rank #7/65 · confidence 3 · eval date 2026-07-09
GPT-5.4
1394.0
Rank #18/66 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner1583.0
Rank #10/66 · confidence 3 · eval date 2026-07-09
GPT-5.4
44.7
Rank #20/61 · confidence 3 · eval date 2026-03-05
GPT-5.6 Terra
winner53.8
Rank #12/61 · 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-5.4 | 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-5.4 | GPT-5.6 Terra |
|---|---|---|
6345ywz API15 tests | GPT-5.4 speed / latency 41 tok/s / 6581ms input / output No data | GPT-5.6 Terra speed / latency N/A / N/A input / output No data |
XShuLab Sub2API15 tests | GPT-5.4 speed / latency 24 tok/s / 2652ms input / output No data | GPT-5.6 Terra speed / latency N/A / N/A input / output No data |
Fengsili API10 tests | GPT-5.4 speed / latency 88 tok/s / 6075ms input / output No data | GPT-5.6 Terra speed / latency N/A / N/A input / output No data |
Omini Api10 tests | GPT-5.4 speed / latency 51 tok/s / 1443ms input / output No data | GPT-5.6 Terra speed / latency N/A / N/A input / output No data |
180txt API5 tests | GPT-5.4 gpt-5.4-2026-03-05 speed / latency 39 tok/s / 3498ms input / output $0/M/$0/M | GPT-5.6 Terra gpt-5.6-terra speed / latency N/A / N/A input / output $1.82/M/$10.95/M |
GPT-5.4 gpt-5.4 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-5.4 gpt-5.4 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-5.4 gpt-5.4 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-5.4 gpt-5.4 speed / latency No data input / output $0.0027/request | GPT-5.6 Terra gpt-5.6-terra speed / latency No data input / output $0.034/M/$0.205/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.