o3 Pro vs Sonar Reasoning Pro
Updated October 21, 2026. 1 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Neither model has a coding score yet, so the two cannot be ranked on coding.
o3 Pro has the edge where the context window is larger, 200K against 128K tokens.
- Shared results
- 1
- o3 Pro only
- 10
- Sonar Reasoning Pro only
- 0
- Like-for-like categories
- 1 of 9
Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, six public coding benchmarks
No call
Neither has a coding score yet.
One side not measured
Intelligence
AA Intelligence Index
o3 Pro
o3 Pro leads, 21.9 against 11.8.
Same board, both measured
Long documents
Listed context window
o3 Pro
o3 Pro takes 200K tokens against 128K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Sonar Reasoning Pro
o3 Pro $0.060, Sonar Reasoning Pro $0.0060 per turn.
List prices
At a glance
- Coding index
- o3 Pro not benchmarked, Sonar Reasoning Pro not benchmarked.
- Widest category
- Intelligence, 10.1 points apart on average over 1 shared benchmark.
- Widest single gap
- AA Intelligence Index: o3 Pro 21.9 against Sonar Reasoning Pro 11.8, 10.1 points apart on a 0 to 100 scale.
- Output price
- o3 Pro $80.00 against Sonar Reasoning Pro $8.00 per million output tokens, 10.0x apart.
- Context window
- o3 Pro takes 200K tokens, Sonar Reasoning Pro 128K.
Benchmark by benchmark
First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.
| Category | o3 Pro | Bars | Sonar Reasoning Pro | Ties |
|---|---|---|---|---|
| Intelligence | 1 | 0 | ||
| All shared boards | 1 | 0 |
CodingDirectional onlySix of these boards feed the Vibe Coding Index2 boards, none shared
| Benchmark | o3 Pro | Sonar Reasoning Pro | Leader |
|---|---|---|---|
| Aider polyglot | 84.9% | Not measured | Only o3 Pro measured |
| WeirdML | 58.2% | Not measured | Only o3 Pro measured |
| Neither model has a result on the other 36 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | o3 Pro | Sonar Reasoning Pro | Leader |
|---|---|---|---|
| AA Intelligence Index | 21.9 | 11.8 | o3 Pro |
| Epoch Capabilities Index | 147.3 | Not measured | Only o3 Pro measured |
Agentic workNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | o3 Pro | Sonar Reasoning Pro | Leader |
|---|---|---|---|
| Neither model has a result on 39 boards here | |||
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index3 boards, none shared
| Benchmark | o3 Pro | Sonar Reasoning Pro | Leader |
|---|---|---|---|
| GPQA Diamond (Artificial Analysis run) | 84.5% | Not measured | Only o3 Pro measured |
| ARC-AGI | 59.3% | Not measured | Only o3 Pro measured |
| ARC-AGI-2 | 4.9% | Not measured | Only o3 Pro measured |
| Neither model has a result on the other 18 boards here | |||
MathNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | o3 Pro | Sonar Reasoning Pro | Leader |
|---|---|---|---|
| Neither model has a result on 13 boards here | |||
KnowledgeNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | o3 Pro | Sonar Reasoning Pro | Leader |
|---|---|---|---|
| Neither model has a result on 17 boards here | |||
Web designNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | o3 Pro | Sonar Reasoning Pro | Leader |
|---|---|---|---|
| Neither model has a result on 9 boards here | |||
GeneralDirectional onlyPublic boards, shown as published, kept out of the index4 boards, none shared
| Benchmark | o3 Pro | Sonar Reasoning Pro | Leader |
|---|---|---|---|
| DTBench | 86.9% | Not measured | Only o3 Pro measured |
| LMCA | 38.5% | Not measured | Only o3 Pro measured |
| Fiction.LiveBench | 97.2% | Not measured | Only o3 Pro measured |
| Creative writing (Lech Mazur) | 84.4% | Not measured | Only o3 Pro measured |
| Neither model has a result on the other 42 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | o3 Pro | Sonar Reasoning Pro | Leader |
|---|---|---|---|
| Neither model has a result on 5 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
Sonar Reasoning Pro costs less
Repository review
50K input + 3K output tokens
Sonar Reasoning Pro costs less
Agent loop
200K input + 10K output tokens
Sonar Reasoning Pro costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | OpenAI o3 Pro | Perplexity Sonar Reasoning Pro |
|---|---|---|
| Maker | OpenAI | Perplexity |
| Weights | No public weights listed | No public weights listed |
| Released | June 10, 2025 | March 7, 2025 |
| Context window | 200K | 128K |
| Input $/Mtok | $20.00 | $2.00 |
| Output $/Mtok | $80.00 | $8.00 |
| Coding index | Not benchmarked | Not benchmarked |
| Independent measurements behind it | 0 | 0 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is o3 Pro better than Sonar Reasoning Pro for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. o3 Pro has the edge where the context window is larger, 200K against 128K tokens.
Which is cheaper, o3 Pro or Sonar Reasoning Pro?
o3 Pro costs $20.00 per million input tokens and $80.00 per million output tokens; Sonar Reasoning Pro costs $2.00 and $8.00. Cost per solved task is known for neither of them.
Which has the bigger context window, o3 Pro or Sonar Reasoning Pro?
o3 Pro, with 200K tokens against 128K.
How many benchmarks is the o3 Pro vs Sonar Reasoning Pro comparison based on?
1 benchmarks have a result for both models as of October 21, 2026. o3 Pro's coding index rests on 0 independent benchmarks and Sonar Reasoning Pro's on 0. Where only one model has a result, the page says so instead of naming a winner.