LLM Comparison
GPT-5.4 vs Sonar Reasoning Pro
Side-by-side specs, pricing & capabilities · Updated April 2026
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2/6 modelsSame tier:
 GPT-5.4 | S Sonar Reasoning Pro | |
|---|---|---|
| Organization |  OpenAI | Perplexity AI |
| OpenTools Score | ||
| Family | GPT | Sonar |
| Status | Current | Current |
| Release Date | Mar 2026 | Mar 2025 |
| Context Window | 1.1M tokens | 128K tokens |
| Input Price | $2.50/M tokens | $2.00/M tokens |
| Output Price | $15.00/M tokens | $8.00/M tokens |
| Pricing Notes | Cache read: $0.2500/M tokens | — |
| Capabilities | textvisioncode | textvisioncodeextended-thinking |
| Max Output | 128K tokens | — |
| API Identifier | openai/gpt-5.4 | perplexity/sonar-reasoning-pro |
| Benchmarks | ||
| MMLU | — | 83 |
| View GPT-5.4 | View Sonar Reasoning Pro | |
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Sonar Reasoning ProCheapest | $2.00 | $4.00 | $6.00 | — |
| GPT-5.4 | $2.50 | $7.50 | $10.00 | +67% |
OpenAI
GPT-5.4
GPT-5.4 is a multimodal llm from OpenAI. Supports up to 1,050,000 token context window. Available from $2.50/M input tokens.
Perplexity AI
Sonar Reasoning Pro
Sonar Reasoning Pro is a multimodal llm from Perplexity AI. Supports up to 128,000 token context window. Achieves 83.0% on MMLU. Available from $2.00/M input tokens.
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