Models, measured side by side
Claude Opus 5.5 vs Sonar Reasoning Pro
Compare Claude Opus 5.5, Sonar Reasoning Pro by token pricing, context length, benchmark results, speed and tool support.
Monthly workload
Monthly cost breakdown
InputOutput
Claude Opus 5.5
$180 / mo
Sonar Reasoning Pro
$80 / mo
Performance comparison
Claude Opus 5.5
57.6
Sonar Reasoning Pro
11.8
Overview
| Overview | Claude Opus 5.5 | Sonar Reasoning Pro |
|---|---|---|
| Provider | Anthropic | Perplexity |
| Released | 2026-09-22 | 2025-03-07 |
| Status | Active | Active |
| Input formats | textimagefile | textimage |
| Output formats | text | text |
Provider
- Claude Opus 5.5
- Anthropic
- Sonar Reasoning Pro
- Perplexity
Released
- Claude Opus 5.5
- 2026-09-22
- Sonar Reasoning Pro
- 2025-03-07
Status
- Claude Opus 5.5
- Active
- Sonar Reasoning Pro
- Active
Input formats
- Claude Opus 5.5
- textimagefile
- Sonar Reasoning Pro
- textimage
Output formats
- Claude Opus 5.5
- text
- Sonar Reasoning Pro
- text
Pricing & capacity
| Pricing & capacity | Claude Opus 5.5 | Sonar Reasoning Pro |
|---|---|---|
| Input / 1M tokens | $4.00 | $2.00 |
| Output / 1M tokens | $20 | $8.00 |
| Cached input / 1M | $0.20 | Not listed |
| Monthly cost | $180 | $80 |
| Context window | 1M | 128K |
| Maximum output | 128K | 115K |
Input / 1M tokens
- Claude Opus 5.5
- $4.00
- Sonar Reasoning Pro
- $2.00
Output / 1M tokens
- Claude Opus 5.5
- $20
- Sonar Reasoning Pro
- $8.00
Cached input / 1M
- Claude Opus 5.5
- $0.20
- Sonar Reasoning Pro
- Not listed
Monthly cost
- Claude Opus 5.5
- $180
- Sonar Reasoning Pro
- $80
Context window
- Claude Opus 5.5
- 1M
- Sonar Reasoning Pro
- 128K
Maximum output
- Claude Opus 5.5
- 128K
- Sonar Reasoning Pro
- 115K
Benchmarks & performance
| Benchmarks & performance | Claude Opus 5.5 | Sonar Reasoning Pro |
|---|---|---|
| Intelligence Index | 57.6 | 11.8 |
| Humanity’s Last Exam | 61.4% | Not listed |
| SciCode | 66.9% | Not listed |
| Output speed | 91 tokens/s | Not listed |
| Time to first token | 755.54 s | Not listed |
| DesignArena rating | 1,407 | Not listed |
| DesignArena win rate | 65.3% | Not listed |
Intelligence Index
- Claude Opus 5.5
- 57.6
- Sonar Reasoning Pro
- 11.8
Humanity’s Last Exam
- Claude Opus 5.5
- 61.4%
- Sonar Reasoning Pro
- Not listed
SciCode
- Claude Opus 5.5
- 66.9%
- Sonar Reasoning Pro
- Not listed
Output speed
- Claude Opus 5.5
- 91 tokens/s
- Sonar Reasoning Pro
- Not listed
Time to first token
- Claude Opus 5.5
- 755.54 s
- Sonar Reasoning Pro
- Not listed
DesignArena rating
- Claude Opus 5.5
- 1,407
- Sonar Reasoning Pro
- Not listed
DesignArena win rate
- Claude Opus 5.5
- 65.3%
- Sonar Reasoning Pro
- Not listed
Tools & features
| Tools & features | Claude Opus 5.5 | Sonar Reasoning Pro |
|---|---|---|
| Function calling | Supported | Not listed |
| Structured outputs | Supported | Not listed |
| JSON mode | Supported | Not listed |
| Reasoning | Supported | Supported |
| Built-in web search | Not listed | Supported |
| Prompt caching | Supported | Not listed |
Function calling
- Claude Opus 5.5
- Supported
- Sonar Reasoning Pro
- Not listed
Structured outputs
- Claude Opus 5.5
- Supported
- Sonar Reasoning Pro
- Not listed
JSON mode
- Claude Opus 5.5
- Supported
- Sonar Reasoning Pro
- Not listed
Reasoning
- Claude Opus 5.5
- Supported
- Sonar Reasoning Pro
- Supported
Built-in web search
- Claude Opus 5.5
- Not listed
- Sonar Reasoning Pro
- Supported
Prompt caching
- Claude Opus 5.5
- Supported
- Sonar Reasoning Pro
- Not listed
API & availability
| API & availability | Claude Opus 5.5 | Sonar Reasoning Pro |
|---|---|---|
| API identifier | claude-opus-5.5 | sonar-reasoning-pro |
| Prices checked | Oct 8, 2026 | Oct 8, 2026 |
API identifier
- Claude Opus 5.5
claude-opus-5.5- Sonar Reasoning Pro
sonar-reasoning-pro
Prices checked
- Claude Opus 5.5
- Oct 8, 2026
- Sonar Reasoning Pro
- Oct 8, 2026
About the models
Claude Opus 5.5
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...
Full pricing & detailsSonar Reasoning Pro
Note: Sonar Pro pricing includes Perplexity search pricing. See [details here](https://docs.perplexity.ai/guides/pricing#detailed-pricing-breakdown-for-sonar-reasoning-pro-and-sonar-pro) Sonar Reasoning Pro is a premier reasoning model powered by DeepSeek R1 with Chain of Thought (CoT). Designed for
Full pricing & detailsComparison FAQ
Claude Opus 5.5: $4.00 input and $20 output per million tokens. Sonar Reasoning Pro: $2.00 input and $8.00 output per million tokens. The cheaper choice depends on your input-to-output ratio; a model can have a lower input rate but a higher output rate.