AI model comparison
Claude Haiku 4.5 vs Sonar Reasoning Pro
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
Anthropic
Claude Haiku 4.5
Claude Haiku 4.5 is Anthropic’s fastest and most efficient model, delivering near-frontier intelligence at a fraction of the cost and latency of larger Claude models.
- Input / 1M
- $1
- Output / 1M
- $5
- Context
- 200K
Perplexity
Sonar 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).
- Input / 1M
- $2
- Output / 1M
- $8
- Context
- 128K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Claude Haiku 4.5
1.8x cheaper for a typical chat
Higher intelligence score
Claude Haiku 4.5
16.9 vs 11.8 on Artificial Analysis
Larger context window
Claude Haiku 4.5
200K vs 128K tokens
Newer release
Claude Haiku 4.5
Released October 15, 2025
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Claude Haiku 4.516.9Sonar Reasoning Pro11.8Coding index
Claude Haiku 4.543.9Sonar Reasoning ProNot availableAgentic index
Claude Haiku 4.58Sonar Reasoning ProNot availablePricing
Claude Haiku 4.5 vs Sonar Reasoning Pro API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Claude Haiku 4.5 | Sonar Reasoning Pro |
|---|---|---|
| Input tokensPer 1M tokens | $1 | $2 |
| Output tokensPer 1M tokens | $5 | $8 |
| Cached input (read)Per 1M tokens | $0.10 | Not available |
| Cache writePer 1M tokens | $1.25 | Not available |
| Web searchPer request | $0.01 | $0.005 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Claude Haiku 4.5$4.50Sonar Reasoning Pro$8Coding task
30K in, 4K out
Claude Haiku 4.5$50$23 cachedSonar Reasoning Pro$92Long document summary
150K in, 2K out
Claude Haiku 4.5$160$25 cachedSonar Reasoning Pro$316Specs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Claude Haiku 4.5 | Sonar Reasoning Pro |
|---|---|---|
| Context window | 200K tokens | 128K tokens |
| Max output | 64K tokens | 115K tokens |
| Input types | File, Image, Text | Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | Not available | Not available |
| Default reasoning effort | Not available | Not available |
| Release date | October 15, 2025 | March 7, 2025 |
Features
Supported features
API features available for each model.
| Metric | Claude Haiku 4.5 | Sonar Reasoning Pro |
|---|---|---|
| Tool calling | Supported | Not supported |
| Structured outputs | Supported | Not supported |
| JSON mode | Supported | Not supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | Not supported |
| Deterministic seed | Not supported | Not supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
Claude Haiku 4.5View full model details- Claude Haiku 4.5 vs Gemini 3.1 Flash Lite
- Claude Haiku 4.5 vs Gemini 2.5 Flash
- Claude Haiku 4.5 vs Claude Sonnet 4.5
- Claude Haiku 4.5 vs Gemini 2.5 Pro
- Claude Haiku 4.5 vs GLM 4.6
- Claude Haiku 4.5 vs o3
- Claude Haiku 4.5 vs Claude Sonnet 4
- Claude Haiku 4.5 vs Qwen3.5-122B-A10B
- Claude Haiku 4.5 vs o4 Mini
- Claude Haiku 4.5 vs Kimi K2 0905
- Claude Haiku 4.5 vs o1
- Claude Haiku 4.5 vs Mistral Medium 3.5
- Claude Haiku 4.5 vs Command A
- Claude Haiku 4.5 vs o3 Mini
Sonar Reasoning ProView full model details- Sonar Reasoning Pro vs Gemini 2.5 Pro
- Sonar Reasoning Pro vs Mistral Medium 3.5
- Sonar Reasoning Pro vs Command A
- Sonar Reasoning Pro vs GPT-4.1
- Sonar Reasoning Pro vs Qwen3 235B A22B Thinking 2507
- Sonar Reasoning Pro vs o3 Mini
- Sonar Reasoning Pro vs o3 Mini High
- Sonar Reasoning Pro vs Nova Premier 1.0
- Sonar Reasoning Pro vs GPT-4o (2024-11-20)
- Sonar Reasoning Pro vs Sonar Pro
Our take
Claude Haiku 4.5 is 1.8x cheaper for a typical chat. Claude Haiku 4.5 scores higher on the Artificial Analysis Intelligence Index (16.9 vs 11.8). Claude Haiku 4.5 has the larger context window (200K vs 128K tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Claude Haiku 4.5 or Sonar Reasoning Pro cheaper?
Claude Haiku 4.5 is cheaper for a typical chat (2K input tokens and 500 output tokens). Claude Haiku 4.5 costs $1 per 1M input tokens and $5 per 1M output tokens, while Sonar Reasoning Pro costs $2 per 1M input tokens and $8 per 1M output tokens.
Which has a bigger context window, Claude Haiku 4.5 or Sonar Reasoning Pro?
Claude Haiku 4.5 supports up to 200K tokens of context, compared with 128K for Sonar Reasoning Pro.
Is Claude Haiku 4.5 smarter than Sonar Reasoning Pro?
On the Artificial Analysis Intelligence Index, Claude Haiku 4.5 scores 16.9 and Sonar Reasoning Pro scores 11.8, putting Claude Haiku 4.5 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Claude Haiku 4.5 and Sonar Reasoning Pro at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Claude Haiku 4.5 and Sonar Reasoning Pro answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Claude Haiku 4.5 and Sonar Reasoning Pro at the same time. Compare the answers side by side and keep the best one.