Data points: 74
Model compare
GPT-4 vs GPT-5.6 Sol
The readout for GPT-4 and GPT-5.6 Sol, before the detailed comparison sheet.
Key Takeaways
Weighted outcome: GPT-5.6 Sol. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.6 Sol
GPT-5.6 Sol has the higher weighted result; Model A / B score 8 to 92.
Evidence depth
74 data points
Includes 4 benchmark rows, 0 audit samples, and 9 provider examples.
Selection signal
Start with GPT-5.6 Sol
The charts below split 13 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-4 and GPT-5.6 Sol: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-4 | GPT-5.6 Sol |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 8.0 pts | 92.0 pts |
| Benchmark category leads | 0 categories | 3 categories |
| Operational advantages | First-token latency, Free providers | Cheapest input price, Average speed, Provider coverage |
| Context window | 8.2K tokens | 1.1M tokens |
| Max output | 4.1K tokens | 128K tokens |
| Modalities | Input Text Output Text | Input FileImageText Output Text |
| Features | Text inputText outputTool callingStructured outputsJSON mode | 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-4 | GPT-5.6 Sol |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | May 2023 | Jul 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | 2021-09-30 | 2026-02-16 |
| OpenRouter ID | openai/gpt-4 | openai/gpt-5.6-sol |
| References | No data | No data |
When to choose each model
This report only uses LMSpeed data for GPT-4 and GPT-5.6 Sol: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-4
GPT-4 has these operational advantages: First-token latency, Free providers.
GPT-5.6 Sol
GPT-5.6 Sol is stronger in benchmark categories (Coding, Reasoning, Math) and operational dimensions (Cheapest input price, Average speed, Provider coverage).
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
- 3 / 8
- Model B coverage
- 7 / 8
- Shared
- 3 shared categories
Avg. score
GPT-4
42.3
Avg. score
GPT-5.6 Sol
61
Agents
GPT-5.6 Sol
Coding
GPT-5.6 Sol leads by 12.4
Reasoning
GPT-5.6 Sol leads by 24.3
Knowledge
GPT-5.6 Sol
Math
GPT-5.6 Sol leads by 26.3
Multilingual
No data
Multimodal
GPT-5.6 Sol
Instruction following
GPT-5.6 Sol
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-4
$30.00/M
Rank #177/179 · confidence 4
GPT-5.6 Sol
winner$4.00/M
Rank #160/179 · confidence 4
GPT-4
$37.50/M
Rank #177/179 · confidence 4
GPT-5.6 Sol
winner$8.00/M
Rank #162/179 · confidence 4
GPT-4
$60.00/M
Rank #172/179 · confidence 4
GPT-5.6 Sol
winner$20.00/M
Rank #162/179 · confidence 4
GPT-4
34.9%
Rank #204/211 · confidence 4
GPT-5.6 Sol
winner92.8%
Rank #11/211 · confidence 4
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-4 | GPT-5.6 Sol |
|---|---|---|
| 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-4 | GPT-5.6 Sol |
|---|---|---|
YUNWU API10 tests | GPT-4 speed / latency N/A / N/A input / output No data | GPT-5.6 Sol speed / latency 53 tok/s / 2164ms input / output No data |
AIGCBAR0 tests | GPT-4 speed / latency N/A / N/A input / output No data | GPT-5.6 Sol speed / latency N/A / N/A input / output No data |
AI发财网0 tests | GPT-4 speed / latency N/A / N/A input / output No data | GPT-5.6 Sol speed / latency N/A / N/A input / output No data |
APIMart0 tests | GPT-4 gpt-4-32k speed / latency N/A / N/A input / output $1.92/M/$7.67/M | GPT-5.6 Sol gpt-5.6-sol speed / latency N/A / N/A input / output $0/M/$0/M |
AiXiaobai API0 tests | GPT-4 speed / latency N/A / N/A input / output No data | GPT-5.6 Sol speed / latency N/A / N/A input / output No data |
GPT-4 gpt-4 speed / latency No data input / output $0/request | GPT-5.6 Sol gpt-5.6-sol speed / latency No data input / output $0/request | |
GPT-4 gpt-4-all speed / latency No data input / output $0.011/request | GPT-5.6 Sol gpt-5.6-sol speed / latency No data input / output $0.685/M/$4.11/M | |
GPT-4 gpt-4-all speed / latency No data input / output $0.011/request | GPT-5.6 Sol gpt-5.6-sol speed / latency No data input / output $0.685/M/$4.11/M | |
GPT-4 gpt-4-all speed / latency No data input / output $0.014/request | GPT-5.6 Sol gpt-5.6-sol speed / latency No data input / output $0.068/M/$0.411/M |
FAQ
Weighted outcome: GPT-5.6 Sol. 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.