AI model comparison
Claude Haiku 4.5 vs Claude Sonnet 4.5
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
Anthropic
Claude Sonnet 4.5
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows.
- Input / 1M
- $3
- Output / 1M
- $15
- Context
- 1M
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Claude Haiku 4.5
3x cheaper for a typical chat
Higher intelligence score
Claude Sonnet 4.5
20.7 vs 16.9 on Artificial Analysis
Larger context window
Claude Sonnet 4.5
1M vs 200K 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 4.516.9Claude Sonnet 4.520.7Coding index
Claude Haiku 4.543.9Claude Sonnet 4.552.1Agentic index
Claude Haiku 4.58Claude Sonnet 4.515.8Pricing
Claude Haiku 4.5 vs Claude Sonnet 4.5 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Claude Haiku 4.5 | Claude Sonnet 4.5 |
|---|---|---|
| Input tokensPer 1M tokens | $1 | $3 |
| Output tokensPer 1M tokens | $5 | $15 |
| Cached input (read)Per 1M tokens | $0.10 | $0.30 |
| Cache writePer 1M tokens | $1.25 | $3.75 |
| Long-context pricingPer 1M tokens, for very long prompts | Same rate at any length | $6 in / $22.50 out above 200K |
| Web searchPer request | $0.01 | $0.01 |
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$4.50Claude Sonnet 4.5$13.50Coding task
30K in, 4K out
Claude Haiku 4.5$50$23 cachedClaude Sonnet 4.5$150$69 cachedLong document summary
150K in, 2K out
Claude Haiku 4.5$160$25 cachedClaude Sonnet 4.5$480$75 cachedSpecs
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 | Claude Sonnet 4.5 |
|---|---|---|
| Context window | 200K tokens | 1M tokens |
| Max output | 64K tokens | 64K tokens |
| Input types | File, Image, Text | File, 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 | September 29, 2025 |
Features
Supported features
API features available for each model.
| Metric | Claude Haiku 4.5 | Claude Sonnet 4.5 |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | 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 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
- Claude Haiku 4.5 vs Sonar Reasoning Pro
Claude Sonnet 4.5View full model details- Claude Sonnet 4.5 vs Claude Sonnet 4.6
- Claude Sonnet 4.5 vs Claude Opus 4.5
- Claude Sonnet 4.5 vs GPT-5.1
- Claude Sonnet 4.5 vs GPT-5.1-Codex
- Claude Sonnet 4.5 vs Gemini 2.5 Pro
- Claude Sonnet 4.5 vs GPT-5
- Claude Sonnet 4.5 vs Claude Opus 4.1
- Claude Sonnet 4.5 vs o3 Pro
- Claude Sonnet 4.5 vs Qwen3.5 397B A17B
- Claude Sonnet 4.5 vs o3
- Claude Sonnet 4.5 vs Claude Sonnet 4
- Claude Sonnet 4.5 vs o1
Our take
Claude Haiku 4.5 is 3x cheaper for a typical chat. Claude Sonnet 4.5 scores higher on the Artificial Analysis Intelligence Index (20.7 vs 16.9). Claude Sonnet 4.5 has the larger context window (1M vs 200K 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 Claude Sonnet 4.5 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 Claude Sonnet 4.5 costs $3 per 1M input tokens and $15 per 1M output tokens.
Which has a bigger context window, Claude Haiku 4.5 or Claude Sonnet 4.5?
Claude Sonnet 4.5 supports up to 1M tokens of context, compared with 200K for Claude Haiku 4.5.
Is Claude Haiku 4.5 smarter than Claude Sonnet 4.5?
On the Artificial Analysis Intelligence Index, Claude Haiku 4.5 scores 16.9 and Claude Sonnet 4.5 scores 20.7, putting Claude Sonnet 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 Claude Sonnet 4.5 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Claude Haiku 4.5 and Claude Sonnet 4.5 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Claude Haiku 4.5 and Claude Sonnet 4.5 at the same time. Compare the answers side by side and keep the best one.