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GPT-5.6 Sol vs GPT-5.4 Pro
Same provider, same context, 6x price difference. Is the Pro upgrade worth it?
Last verified: Jul 13, 2026 · See all 67 models ranked →
| Feature | GPT-5.6 Sol | GPT-5.4 Pro |
|---|---|---|
| Input price (per 1M tokens) | $5.00 | $30.00 |
| Output price (per 1M tokens) | $30.00 | $180.00 |
| Context window | 1.05M tokens | 1.05M tokens |
| Standard request cost | $0.0195 | $0.117 |
| Output-heavy request cost | $0.06 | $0.36 |
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OpenAI
GPT-5.6 Sol
$0
estimated monthly cost
Input cost$0
Output cost$0
Per request$0
OpenAI
GPT-5.4 Pro
$0
estimated monthly cost
Input cost$0
Output cost$0
Per request$0
The Verdict
GPT-5.6 Sol is the clear value winner. GPT-5.4 Pro only makes sense for niche use cases.
GPT-5.6 Sol ($5/$30) costs 83% less than GPT-5.4 Pro ($30/$180) while offering the same 1.05M context window. For most workloads, Sol delivers sufficient performance at a fraction of the cost. Only consider GPT-5.4 Pro if you need its enhanced reasoning capabilities for extremely complex tasks — and even then, test whether Sol handles your workload adequately before committing.
When to Choose GPT-5.6 Sol
- Cost-sensitive production: At $5/$30, Sol is 83% cheaper than Pro. For high-volume APIs, this saves thousands per month.
- Standard workloads: Chatbots, code generation, summarization, translation — Sol handles these at a fraction of Pro's cost.
- Startup budgets: If you're building an AI startup, Sol gives you 6x the requests for the same budget vs Pro.
When to Choose GPT-5.4 Pro
- Extreme reasoning complexity: If your tasks require the absolute highest reasoning capabilities and Sol produces inadequate results.
- Research & evaluation: For benchmarking or tasks where the Pro tier's enhanced reasoning justifies the 6x cost premium.
- Critical applications: When the cost of errors exceeds the cost premium — e.g., financial analysis, legal reasoning, or safety-critical systems.
Cost Comparison: Real-World Scenarios
Chatbot (1,000 requests/day, 1,500 input, 400 output)
GPT-5.6 Sol$585.00/mo
GPT-5.4 Pro$3,510.00/mo
Monthly savings$2,925.00/mo (83%)
Code Generation (200 requests/day, 3,000 input, 1,200 output)
GPT-5.6 Sol$3,600.00/mo
GPT-5.4 Pro$21,600.00/mo
Monthly savings$18,000.00/mo (83%)
RAG Pipeline (500 queries/day, 5,000 input, 800 output)
GPT-5.6 Sol$1,950.00/mo
GPT-5.4 Pro$11,700.00/mo
Monthly savings$9,750.00/mo (83%)
Full Comparison Table
| Model | Input/1M | Output/1M | vs GPT-5.6 Sol | Context |
|---|---|---|---|---|
| GPT-5.6 Sol | $5.00 | $30.00 | — | 1.05M |
| GPT-5.4 Pro | $30.00 | $180.00 | 500% more expensive input, 500% more expensive output | 1.05M |
| GPT-5.6 Terra | $2.50 | $15.00 | 50% cheaper input, 50% cheaper output | 1.05M |
| GPT-5.5 | $5.00 | $30.00 | Same price | 1.05M |
| Claude Opus 4.8 | $5.00 | $25.00 | Same input, 17% cheaper output | 1M |
| Claude Sonnet 5 | $2.00 | $10.00 | 60% cheaper input, 67% cheaper output | 1M |
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