Best AI models for complex reasoning
Multi-step analysis, maths and planning need models that think before answering. These are the deepest-reasoning models available on TokenRex.
Flagship models first
Live TokenRex prices. Per 1M tokens for chat and embeddings; per unit for media.
| # | Model | Input | Output / unit | Web search / 1K |
|---|---|---|---|---|
| 1 | GPT-5.4 Pro gpt-5.4-pro | $30.00 | $180.00 | $10.00 |
| 2 | GPT-5.4 Pro Deep gpt-5.4-pro-high | $30.00 | $180.00 | $10.00 |
| 3 | GPT-5.4 Pro Max gpt-5.4-pro-xhigh | $30.00 | $180.00 | $10.00 |
| 4 | GPT-5.5 Pro gpt-5.5-pro | $30.00 | $180.00 | $10.00 |
| 5 | GPT-5.5 Pro Deep gpt-5.5-pro-high | $30.00 | $180.00 | $10.00 |
| 6 | GPT-5.5 Pro Max gpt-5.5-pro-xhigh | $30.00 | $180.00 | $10.00 |
| 7 | GPT-6 Astra Fast Max gpt-6-astra-fast-xhigh | $20.00 | $100.00 | $10.00 |
| 8 | Claude Fable 5.1 Max claude-fable-5-1-xhigh | $10.00 | $50.00 | $10.00 |
| 9 | Claude Opus 5 Fast claude-opus-5-fast | $10.00 | $50.00 | $10.00 |
| 10 | Claude Opus 5 Fast High claude-opus-5-fast-high | $10.00 | $50.00 | $10.00 |
| 11 | Claude Opus 5 Fast Low claude-opus-5-fast-low | $10.00 | $50.00 | $10.00 |
| 12 | Claude Opus 5 Fast Max claude-opus-5-fast-xhigh | $10.00 | $50.00 | $10.00 |
How to choose
- Higher thinking levels cost more output tokens — use them only where accuracy matters.
- Ask for a short final answer to keep output cost down.
Try it with one API key
curl https://tokenrex.ai/api/public/v1/chat/completions \
-H "Authorization: Bearer $TOKENREX_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"gpt-5.4-pro","messages":[{"role":"user","content":"Hello"}]}'Head-to-head comparisons
Questions
- How are these reasoning models ranked?
- Models are listed from the live TokenRex catalog and ordered by current price. We do not publish invented quality scores; open a model page for source-linked benchmarks where they exist.
- Can I switch models later?
- Yes. Every model uses the same TokenRex API key and endpoint, so switching is a one-line change to the model ID.
- Do prices include a markup?
- Prices shown are the live TokenRex rates billed from your wallet. They update automatically when provider prices change.