GPT-4o vs GPT-5.6 Sol
Pricing, benchmarks, and use case comparison
Quick take
- •GPT-4o is meaningfully stronger at cost efficiency (82 vs 55 on our capability index).
- •GPT-5.6 Sol is meaningfully stronger at math (95 vs 62).
- •GPT-4o is 50% cheaper on input tokens, which compounds fast on high-volume or agentic workloads.
Specs comparison
| GPT-4o | GPT-5.6 Sol | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Type | Closed source | Closed source |
| Context window | ✓128,000 tokens (16,384 max output) | Not announced |
| Input / 1M tokens | ✓$2.50 | $5.00 |
| Output / 1M tokens | $10.00 | $30.00 |
| Release date | 2024-05 | 2026-06 |
Benchmarks
| Benchmark | GPT-4o | GPT-5.6 Sol |
|---|---|---|
| MMLU | 88.7% | - |
| HumanEval | 90.2% | - |
| MATH | 76.6% | - |
| Terminal-Bench 2.1 | - | 88.8% |
| Terminal-Bench 2.1 (Ultra) | - | 91.9% |
| ExploitBench | - | competitive with Mythos Preview |
Scores sourced from official provider release posts and independent benchmark aggregators.
Which should you choose?
Choose GPT-4o if...
- →Everyday assistant, drafting, summarization, and classification tasks
- →Latency- and cost-sensitive applications at scale
- →Multimodal tasks needing image understanding with fast responses
Choose GPT-5.6 Sol if...
- →You are an approved preview partner needing the most capable model for agentic software engineering
- →Complex multi-step tasks that benefit from subagent orchestration (Ultra) or maximum reasoning depth (max)
- →Frontier scientific research, professional knowledge work, or security-sensitive workloads