Models, measured side by side
DeepSeek V4.1 Flash vs Sonar Reasoning Pro
Compare DeepSeek V4.1 Flash, Sonar Reasoning Pro by token pricing, context length, benchmark results, speed and tool support.
Monthly workload
Monthly cost breakdown
InputOutput
DeepSeek V4.1 Flash
$7.00 / mo
Sonar Reasoning Pro
$80 / mo
Performance comparison
DeepSeek V4.1 Flash
39.5
Sonar Reasoning Pro
11.8
Overview
| Overview | DeepSeek V4.1 Flash | Sonar Reasoning Pro |
|---|---|---|
| Provider | DeepSeek | Perplexity |
| Released | 2026-09-10 | 2025-03-07 |
| Status | Active | Active |
| Input formats | textimage | textimage |
| Output formats | text | text |
Provider
- DeepSeek V4.1 Flash
- DeepSeek
- Sonar Reasoning Pro
- Perplexity
Released
- DeepSeek V4.1 Flash
- 2026-09-10
- Sonar Reasoning Pro
- 2025-03-07
Status
- DeepSeek V4.1 Flash
- Active
- Sonar Reasoning Pro
- Active
Input formats
- DeepSeek V4.1 Flash
- textimage
- Sonar Reasoning Pro
- textimage
Output formats
- DeepSeek V4.1 Flash
- text
- Sonar Reasoning Pro
- text
Pricing & capacity
| Pricing & capacity | DeepSeek V4.1 Flash | Sonar Reasoning Pro |
|---|---|---|
| Input / 1M tokens | $0.05 | $2.00 |
| Output / 1M tokens | $1.20 | $8.00 |
| Cached input / 1M | $0.02 | Not listed |
| Monthly cost | $7.00 | $80 |
| Context window | 1M | 128K |
| Maximum output | 944K | 115K |
Input / 1M tokens
- DeepSeek V4.1 Flash
- $0.05
- Sonar Reasoning Pro
- $2.00
Output / 1M tokens
- DeepSeek V4.1 Flash
- $1.20
- Sonar Reasoning Pro
- $8.00
Cached input / 1M
- DeepSeek V4.1 Flash
- $0.02
- Sonar Reasoning Pro
- Not listed
Monthly cost
- DeepSeek V4.1 Flash
- $7.00
- Sonar Reasoning Pro
- $80
Context window
- DeepSeek V4.1 Flash
- 1M
- Sonar Reasoning Pro
- 128K
Maximum output
- DeepSeek V4.1 Flash
- 944K
- Sonar Reasoning Pro
- 115K
Benchmarks & performance
| Benchmarks & performance | DeepSeek V4.1 Flash | Sonar Reasoning Pro |
|---|---|---|
| Intelligence Index | 39.5 | 11.8 |
| Humanity’s Last Exam | 39.2% | Not listed |
| SciCode | 51.9% | Not listed |
| Output speed | 213 tokens/s | Not listed |
| Time to first token | 1.05 s | Not listed |
| DesignArena rating | 1,325 | Not listed |
| DesignArena win rate | 52.1% | Not listed |
Intelligence Index
- DeepSeek V4.1 Flash
- 39.5
- Sonar Reasoning Pro
- 11.8
Humanity’s Last Exam
- DeepSeek V4.1 Flash
- 39.2%
- Sonar Reasoning Pro
- Not listed
SciCode
- DeepSeek V4.1 Flash
- 51.9%
- Sonar Reasoning Pro
- Not listed
Output speed
- DeepSeek V4.1 Flash
- 213 tokens/s
- Sonar Reasoning Pro
- Not listed
Time to first token
- DeepSeek V4.1 Flash
- 1.05 s
- Sonar Reasoning Pro
- Not listed
DesignArena rating
- DeepSeek V4.1 Flash
- 1,325
- Sonar Reasoning Pro
- Not listed
DesignArena win rate
- DeepSeek V4.1 Flash
- 52.1%
- Sonar Reasoning Pro
- Not listed
Tools & features
| Tools & features | DeepSeek V4.1 Flash | 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 |
| Log probabilities | Supported | Not listed |
| Deterministic seed | Supported | Not listed |
| Prompt caching | Supported | Not listed |
Function calling
- DeepSeek V4.1 Flash
- Supported
- Sonar Reasoning Pro
- Not listed
Structured outputs
- DeepSeek V4.1 Flash
- Supported
- Sonar Reasoning Pro
- Not listed
JSON mode
- DeepSeek V4.1 Flash
- Supported
- Sonar Reasoning Pro
- Not listed
Reasoning
- DeepSeek V4.1 Flash
- Supported
- Sonar Reasoning Pro
- Supported
Built-in web search
- DeepSeek V4.1 Flash
- Not listed
- Sonar Reasoning Pro
- Supported
Log probabilities
- DeepSeek V4.1 Flash
- Supported
- Sonar Reasoning Pro
- Not listed
Deterministic seed
- DeepSeek V4.1 Flash
- Supported
- Sonar Reasoning Pro
- Not listed
Prompt caching
- DeepSeek V4.1 Flash
- Supported
- Sonar Reasoning Pro
- Not listed
API & availability
| API & availability | DeepSeek V4.1 Flash | Sonar Reasoning Pro |
|---|---|---|
| API identifier | deepseek-v4.1-flash | sonar-reasoning-pro |
| Prices checked | Oct 8, 2026 | Oct 8, 2026 |
API identifier
- DeepSeek V4.1 Flash
deepseek-v4.1-flash- Sonar Reasoning Pro
sonar-reasoning-pro
Prices checked
- DeepSeek V4.1 Flash
- Oct 8, 2026
- Sonar Reasoning Pro
- Oct 8, 2026
About the models
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the first built on the company's Causal Encoder-Decoder (CED) architecture. It activates 8B parameters on input and 16B on...
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
DeepSeek V4.1 Flash: $0.05 input and $1.20 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.