Sonar Reasoning Pro vs Qwen3.5-9B
Qwen3.5-9B leads Sonar Reasoning Pro on the Artificial Analysis Intelligence Index, 13.3 to 11.8, and Qwen3.5-9B costs 53.3x less per output token ($0.15 vs $8.00 per million). Updated October 21, 2026; 1 benchmarks have a result for both.
Sonar Reasoning Pro or Qwen3.5-9B: which to pick
Neither model has a coding score yet, so the two cannot be ranked on coding.
Pick Sonar Reasoning Pro for work measured by AA Intelligence Index, where it leads.
- Shared results
- 1
- Sonar Reasoning Pro only
- 0
- Qwen3.5-9B only
- 14
- Like-for-like categories
- 1 of 9
Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.
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
Qwen3.5-9B
Qwen3.5-9B leads, 13.3 against 11.8.
Same board, both measured
Long documents
Listed context window
Qwen3.5-9B
Qwen3.5-9B takes 262K tokens against 128K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Qwen3.5-9B
Sonar Reasoning Pro $0.0060, Qwen3.5-9B $0.0002 per turn.
List prices
At a glance
- Coding index
- Sonar Reasoning Pro not benchmarked, Qwen3.5-9B not benchmarked.
- Widest category
- Intelligence, 1.5 points apart on average over 1 shared benchmark.
- Widest single gap
- AA Intelligence Index: Sonar Reasoning Pro 11.8 against Qwen3.5-9B 13.3, 1.5 points apart on a 0 to 100 scale.
- Output price
- Sonar Reasoning Pro $8.00 against Qwen3.5-9B $0.15 per million output tokens, 53.3x apart.
- Context window
- Sonar Reasoning Pro takes 128K tokens, Qwen3.5-9B 262K.
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 | Sonar Reasoning Pro | Bars | Qwen3.5-9B | Ties |
|---|---|---|---|---|
| Intelligence | 0 | 1 | ||
| All shared boards | 0 | 1 |
CodingDirectional onlySix of these boards feed the Vibe Coding Index4 boards, none shared
| Benchmark | Sonar Reasoning Pro | Qwen3.5-9B | Leader |
|---|---|---|---|
| AA Coding Index | Not measured | 23.5 | Only Qwen3.5-9B measured |
| SciCode | Not measured | 29.5% | Only Qwen3.5-9B measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 24.2% | Only Qwen3.5-9B measured |
| Terminal-Bench | Not measured | 9.2% | Only Qwen3.5-9B measured |
| Neither model has a result on the other 34 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Sonar Reasoning Pro | Qwen3.5-9B | Leader |
|---|---|---|---|
| AA Intelligence Index | 11.8 | 13.3 | Qwen3.5-9B |
| Epoch Capabilities Index | Not measured | 139.3 | Only Qwen3.5-9B measured |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | Sonar Reasoning Pro | Qwen3.5-9B | Leader |
|---|---|---|---|
| τ²-Bench Telecom | Not measured | 86.8% | Only Qwen3.5-9B measured |
| Neither model has a result on the other 38 boards here | |||
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index3 boards, none shared
| Benchmark | Sonar Reasoning Pro | Qwen3.5-9B | Leader |
|---|---|---|---|
| GPQA Diamond (Artificial Analysis run) | Not measured | 80.6% | Only Qwen3.5-9B measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 14.9% | Only Qwen3.5-9B measured |
| GPQA Diamond (Epoch AI run) | Not measured | 79.0% | Only Qwen3.5-9B measured |
| Neither model has a result on the other 18 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | Sonar Reasoning Pro | Qwen3.5-9B | Leader |
|---|---|---|---|
| OTIS Mock AIME | Not measured | 61.7% | Only Qwen3.5-9B measured |
| Neither model has a result on the other 12 boards here | |||
KnowledgeNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Sonar Reasoning Pro | Qwen3.5-9B | 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 | Sonar Reasoning Pro | Qwen3.5-9B | 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 | Sonar Reasoning Pro | Qwen3.5-9B | Leader |
|---|---|---|---|
| IFBench | Not measured | 66.7% | Only Qwen3.5-9B measured |
| Long context reasoning (AA-LCR) | Not measured | 70.0% | Only Qwen3.5-9B measured |
| DTBench | Not measured | 71.2% | Only Qwen3.5-9B measured |
| LMCA | Not measured | 24.5% | Only Qwen3.5-9B 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 | Sonar Reasoning Pro | Qwen3.5-9B | 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
Qwen3.5-9B costs less
Repository review
50K input + 3K output tokens
Qwen3.5-9B costs less
Agent loop
200K input + 10K output tokens
Qwen3.5-9B 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 | Perplexity Sonar Reasoning Pro | Qwen3.5-9B |
|---|---|---|
| Maker | Perplexity | Qwen |
| Weights | No public weights listed | Open weights |
| Released | March 7, 2025 | March 10, 2026 |
| Context window | 128K | 262K |
| Input $/Mtok | $2.00 | $0.10 |
| Output $/Mtok | $8.00 | $0.15 |
| 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 Sonar Reasoning Pro better than Qwen3.5-9B for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Sonar Reasoning Pro for work measured by AA Intelligence Index, where it leads.
Which is cheaper, Sonar Reasoning Pro or Qwen3.5-9B?
Sonar Reasoning Pro costs $2.00 per million input tokens and $8.00 per million output tokens; Qwen3.5-9B costs $0.10 and $0.15. Cost per solved task is known for neither of them.
Which has the bigger context window, Sonar Reasoning Pro or Qwen3.5-9B?
Qwen3.5-9B, with 262K tokens against 128K.
How many benchmarks is the Sonar Reasoning Pro vs Qwen3.5-9B comparison based on?
1 benchmarks have a result for both models as of October 21, 2026. Sonar Reasoning Pro's coding index rests on 0 independent benchmarks and Qwen3.5-9B's on 0. Where only one model has a result, the page says so instead of naming a winner.