AI model comparison
Claude Sonnet 5.5 vs Claude Haiku 4.5
Side by side comparison of Claude Sonnet 5.5 and Claude Haiku 4.5 on pricing, benchmark scores, context window, and more.
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade.
- Input / 1M
- $2
- Output / 1M
- $10
- Context
- 1M
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
Comparing image generators? Compare image models
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Claude Haiku 4.5
2x cheaper for a typical chat
Higher intelligence score
Not available
Not enough benchmark data
Larger context window
Claude Sonnet 5.5
1M vs 200K tokens
Newer release
Claude Sonnet 5.5
Released September 28, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Claude Sonnet 5.554.2Claude Haiku 4.5Not availableCoding index
Claude Sonnet 5.5Not availableClaude Haiku 4.543.9Agentic index
Claude Sonnet 5.5Not availableClaude Haiku 4.58Pricing
Claude Sonnet 5.5 vs Claude Haiku 4.5 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Claude Sonnet 5.5 | Claude Haiku 4.5 |
|---|---|---|
| Input tokensPer 1M tokens | $2 | $1 |
| Output tokensPer 1M tokens | $10 | $5 |
| Cached input (read)Per 1M tokens | $0.10 | $0.10 |
| Cache writePer 1M tokens | $2.50 | $1.25 |
| 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 Sonnet 5.5$9Claude Haiku 4.5$4.50Coding task
30K in, 4K out
Claude Sonnet 5.5$100$43 cachedClaude Haiku 4.5$50$23 cachedLong document summary
150K in, 2K out
Claude Sonnet 5.5$320$35 cachedClaude Haiku 4.5$160$25 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Claude Sonnet 5.5 | Claude Haiku 4.5 |
|---|---|---|
| Context window | 1M tokens | 200K tokens |
| Max output | 128K tokens | 64K tokens |
| Input types | File, Image, Text | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | Max, Extra high, High, Medium, Low | Not available |
| Default reasoning effort | High | Not available |
| Release date | September 28, 2026 | October 15, 2025 |
Features
Supported features
API features available for each model.
| Metric | Claude Sonnet 5.5 | Claude Haiku 4.5 |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Not supported | Supported |
| Stop sequences | Supported | Supported |
| Deterministic seed | Not supported | Not supported |
| Verbosity control | 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 Sonnet 5.5View full model details- Claude Sonnet 5.5 vs Claude Opus 5.5
- Claude Sonnet 5.5 vs GPT-6 Astra
- Claude Sonnet 5.5 vs GPT-6.1 Sol
- Claude Sonnet 5.5 vs GPT-6.1 Terra
- Claude Sonnet 5.5 vs Gemini 4 Argon
- Claude Sonnet 5.5 vs Claude Fable 5.1
- Claude Sonnet 5.5 vs Kimi K3.1 Pro
- Claude Sonnet 5.5 vs Muse Spark 1.3
- Claude Sonnet 5.5 vs Claude Haiku 5.5
- Claude Sonnet 5.5 vs DeepSeek V4.1 Flash 1017
- Claude Sonnet 5.5 vs DeepSeek V4.1 Flash
- Claude Sonnet 5.5 vs GLM 5.3 Flash
- Claude Sonnet 5.5 vs Hy4 preview
- Claude Sonnet 5.5 vs GPT-6 Luna
- Claude Sonnet 5.5 vs Kimi K3
- Claude Sonnet 5.5 vs GLM 5.2
- Claude Sonnet 5.5 vs Claude Sonnet 5
- Claude Sonnet 5.5 vs Claude Opus 5
- Claude Sonnet 5.5 vs GPT-5.6 Sol
- Claude Sonnet 5.5 vs GPT-6 Sol
- Claude Sonnet 5.5 vs Claude Sonnet 4.5
- Claude Sonnet 5.5 vs Claude Sonnet 4.6
- Claude Sonnet 5.5 vs GPT-5.6 Terra
- Claude Sonnet 5.5 vs Claude Opus 4.8
- Claude Sonnet 5.5 vs Grok 4.6
- Claude Sonnet 5.5 vs Muse Wonder
Claude Haiku 4.5View full model details- Claude Haiku 4.5 vs DeepSeek V4.1 Flash 1017
- Claude Haiku 4.5 vs Hy4 preview
- Claude Haiku 4.5 vs Claude Opus 5.5
- Claude Haiku 4.5 vs Step 5 Preview
- Claude Haiku 4.5 vs GPT-6.1 Sol
- Claude Haiku 4.5 vs Gemini 3.8 Flash
- Claude Haiku 4.5 vs GLM 5.2
- Claude Haiku 4.5 vs Claude Sonnet 5
- Claude Haiku 4.5 vs Grok 4.7
Our take
Claude Haiku 4.5 is 2x cheaper for a typical chat. Claude Sonnet 5.5 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 Sonnet 5.5 or Claude Haiku 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 5.5 costs $2 per 1M input tokens and $10 per 1M output tokens.
Which has a bigger context window, Claude Sonnet 5.5 or Claude Haiku 4.5?
Claude Sonnet 5.5 supports up to 1M tokens of context, compared with 200K for Claude Haiku 4.5.
Can I use Claude Sonnet 5.5 and Claude Haiku 4.5 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Claude Sonnet 5.5 and Claude Haiku 4.5 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Claude Sonnet 5.5 and Claude Haiku 4.5 at the same time. Compare the answers side by side and keep the best one.