Model comparison
GPT-5.6 Sol vs GPT-5.4
- Input
- $4.00
- Output
- $20.00
- Context
- 1.05M
- Released
- 2026-07-09
- Input
- $2.50 / 1M tokens
- Output
- $15.00 / 1M tokens
- Context
- 1M
- Released
- 2026-03-05
GPT-5.4 is cheaper on input tokens ($2.5 vs $4 per 1M, 1.6×); GPT-5.6 Sol has the larger context window (1.05M vs 1M).
Specs and pricing side by side
| Spec | GPT-5.6 Sol | GPT-5.4 |
|---|---|---|
| Maker | OpenAI | OpenAIsame |
| Released | 2026-07-09 | 2026-03-05 |
| Context window | 1.05M | 1M |
| Max output | 128K | 128Ksame |
| Input price | $4.00 | $2.50 / 1M tokens |
| Output price | $20.00 | $15.00 / 1M tokens |
| License | Proprietary | Proprietarysame |
| Weights | API only | API onlysame |
| Modalities | Text, Vision | Text, Visionsame |
| Knowledge cutoff | 2026-02-16 | Not publicly disclosed |
Not published by either maker: parameters.
Benchmarks both models report
These two models have no benchmark in common in our registry, so there is no like-for-like score to compare. See each model’s own results: GPT-5.6 Sol, GPT-5.4.
Which one should you pick?
Pick GPT-5.6 Sol if…
- You need the longer context (1.05M vs 1M).
- Your use case is: reach for it when an agentic coding task needs the most capable single model and the longest reasoning budget.
Pick GPT-5.4 if…
- Cost matters: input tokens cost 1.6× less ($2.5 vs $4 per 1M).
- Your use case is: agentic coding and software engineering over large repositories.
FAQ
Which is better, GPT-5.6 Sol or GPT-5.4?
GPT-5.4 is cheaper on input tokens ($2.5 vs $4 per 1M, 1.6×); GPT-5.6 Sol has the larger context window (1.05M vs 1M). The better pick depends on whether you value benchmark scores, price per token, context length or openness for your workload.
How much cheaper is GPT-5.4?
GPT-5.6 Sol: $4.00 input, $20.00 output. GPT-5.4: $2.50 / 1M tokens input, $15.00 / 1M tokens output (list API prices as published by each maker).
What are the context windows of GPT-5.6 Sol and GPT-5.4?
GPT-5.6 Sol offers 1.05M with up to 128K output; GPT-5.4 offers 1M with up to 128K output.
Is GPT-5.6 Sol newer than GPT-5.4?
GPT-5.6 Sol was released 2026-07-09; GPT-5.4 was released 2026-03-05.