AI model comparison
Claude Opus 5.5 vs Claude Haiku 4.5
Side by side comparison of Claude Opus 5.5 and Claude Haiku 4.5 on pricing, benchmark scores, context window, and more.
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.
- Input / 1M
- $4
- Output / 1M
- $20
- 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
4x cheaper for a typical chat
Higher intelligence score
Not available
Not enough benchmark data
Larger context window
Claude Opus 5.5
1M vs 200K tokens
Newer release
Claude Opus 5.5
Released September 22, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Claude Opus 5.558.4Claude Haiku 4.5Not availableCoding index
Claude Opus 5.5Not availableClaude Haiku 4.543.9Agentic index
Claude Opus 5.5Not availableClaude Haiku 4.58Pricing
Claude Opus 5.5 vs Claude Haiku 4.5 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Claude Opus 5.5 | Claude Haiku 4.5 |
|---|---|---|
| Input tokensPer 1M tokens | $4 | $1 |
| Output tokensPer 1M tokens | $20 | $5 |
| Cached input (read)Per 1M tokens | $0.20 | $0.10 |
| Cache writePer 1M tokens | $5 | $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 Opus 5.5$18Claude Haiku 4.5$4.50Coding task
30K in, 4K out
Claude Opus 5.5$200$86 cachedClaude Haiku 4.5$50$23 cachedLong document summary
150K in, 2K out
Claude Opus 5.5$640$70 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 Opus 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 22, 2026 | October 15, 2025 |
Features
Supported features
API features available for each model.
| Metric | Claude Opus 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 Opus 5.5View full model details- Claude Opus 5.5 vs GPT-6 Astra
- Claude Opus 5.5 vs GPT-6.1 Sol
- Claude Opus 5.5 vs Claude Sonnet 5.5
- Claude Opus 5.5 vs GPT-6.1 Terra
- Claude Opus 5.5 vs DeepSeek V4.1 Flash 1017
- Claude Opus 5.5 vs Gemini 4 Argon
- Claude Opus 5.5 vs DeepSeek V4.1 Flash
- Claude Opus 5.5 vs Claude Fable 5.1
- Claude Opus 5.5 vs GLM 5.3 Flash
- Claude Opus 5.5 vs Kimi K3.1 Pro
- Claude Opus 5.5 vs Hy4 preview
- Claude Opus 5.5 vs Muse Spark 1.3
- Claude Opus 5.5 vs GPT-6 Luna
- Claude Opus 5.5 vs Claude Haiku 5.5
- Claude Opus 5.5 vs Grok 4.7
- Claude Opus 5.5 vs GLM 5.3
- Claude Opus 5.5 vs Step 5 Preview
- Claude Opus 5.5 vs MiMo-V2.6-Flash
- Claude Opus 5.5 vs DeepSeek V4 Flash 0731
- Claude Opus 5.5 vs Hy3
- Claude Opus 5.5 vs Kimi K3
- Claude Opus 5.5 vs GLM 5.2
- Claude Opus 5.5 vs Claude Sonnet 5
- Claude Opus 5.5 vs Claude Opus 5
- Claude Opus 5.5 vs GPT-5.6 Sol
- Claude Opus 5.5 vs GPT-6 Sol
- Claude Opus 5.5 vs Claude Sonnet 4.5
- Claude Opus 5.5 vs Claude Sonnet 4.6
- Claude Opus 5.5 vs GPT-5.6 Terra
- Claude Opus 5.5 vs Claude Opus 4.8
- Claude Opus 5.5 vs Grok 4.6
- Claude Opus 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 Step 5 Preview
- Claude Haiku 4.5 vs GPT-6.1 Sol
- Claude Haiku 4.5 vs Claude Sonnet 5.5
- 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 4x cheaper for a typical chat. Claude Opus 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 Opus 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 Opus 5.5 costs $4 per 1M input tokens and $20 per 1M output tokens.
Which has a bigger context window, Claude Opus 5.5 or Claude Haiku 4.5?
Claude Opus 5.5 supports up to 1M tokens of context, compared with 200K for Claude Haiku 4.5.
Can I use Claude Opus 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 Opus 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 Opus 5.5 and Claude Haiku 4.5 at the same time. Compare the answers side by side and keep the best one.