o3 vs Sonar Reasoning Pro
o3 at $2.30 in and $9.20 out and Sonar Reasoning Pro at $2.30 in and $9.20 out — per million tokens, from the same wallet.
o3
OpenAI
1.9¢
for a client proposal
$2.30 in · $9.20 out / 1M
200K context · released April 2025
Sonar Reasoning Pro
Perplexity
1.9¢
for a client proposal
$2.30 in · $9.20 out / 1M
128K context · released March 2025
Asking all both at once — identical prompt, identical context — costs about 3.8¢ for a typical client proposal.
At a glance
- All 2 cost the same on input.
- Largest context: o3 at 200K tokens — about 290 pages.
Cost per task
Estimated totals at the rates above. Solid bar is input, lighter bar is output.
Quick code fix
2K in · 500 outDraft a client proposal from notes
5K in · 800 outContext-heavy session (Alyph workspace)
155K in · 4K outAnalyze a 50-page legal contract
35K in · 1K outLarge architecture refactor
250K in · 3K outSolid part of each bar is input tokens, the lighter part is output. Models that don’t fit a task are marked instead of priced.
Cost vs Token Amount
Drag the slider to adjust the split between input and output workload.
Adjust the ratio slider to change how output tokens influence the final price for equivalent workloads.
Pricing
Specs
Try it with real numbers
2K tokens in · 500 tokens out.
All 2, same prompt and context: 1.8¢. That is the entire cost of the comparison.
Your $5 welcome credit covers about 271 of these.
Which should you pick?
For long documents, o3 has the largest context window here — 200K tokens.
On price they are identical: about 1.9¢ for a typical task each.
Or don’t pick. Send the identical prompt to all both, read the answers side by side, and keep the winner. How to run a fair bake-off →
Questions, answered
Which is cheaper, o3 or Sonar Reasoning Pro?
Which has the largest context window?
Can I run o3 and Sonar Reasoning Pro side by side on Alyph?
Ask both at once
Identical prompt, identical context, answers side by side — about 3.8¢ for a typical client proposal. Free to start, with $5 of credit.