Claude Haiku 3.5 vs Claude Haiku 4.5
Claude Haiku 4.5 comes out ahead, 66 to 49 on our weighted score, and it is the cheaper option too.
AnthropicClaude Haiku 3.5
49/100- ECI127.2
- Price—
- Context200K
- Our pickAnthropic
Claude Haiku 4.5
66/100- ECI142.4
- Price$1.00 / $5.00
- Context200K
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Claude Haiku 4.5 is our pick
Claude Haiku 4.5 is the better all-round choice, scoring 66/100 against Claude Haiku 3.5 (49). It leads on capability and inputs & features. The score weighs capability 67%, inputs & features 20%, context window 13%.
- CapabilityClaude Haiku 4.5Capabilities Index (ECI): Claude Haiku 4.5 142.4 · Claude Haiku 3.5 127.2
- Lowest priceClaude Haiku 4.5Claude Haiku 4.5 $2.00 per 1M tokens (3:1 blend) · Claude Haiku 3.5 unpriced
- Longest contextAbout the sameClaude Haiku 3.5 200,000 · Claude Haiku 4.5 200,000 tokens
- Widest inputsSame inputsClaude Haiku 3.5: Text, Images, PDFs · Claude Haiku 4.5: Text, Images, PDFs
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Claude Haiku 3.5 | Claude Haiku 4.5 |
|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 67% | 49 | 69 |
| Inputs & features | 20% | 60 | 80 |
| Context window | 13% | 32 | 32 |
| Overall | 100% | 49/100 | 66/100 |
Left out because at least one model lacks the data: price. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Claude Haiku 3.5Anthropic | Claude Haiku 4.5Anthropic |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | 127.2 | 142.4 (best) |
| ECI rank | #134 of 148 | #90 of 148 (best) |
| GPQA DiamondGraduate-level science questions | 38.1% | 71.2% (best) |
| OTIS Mock AIME 2024–2025Competition mathematics | 4.3% | 66.7% (best) |
| SimpleQA VerifiedShort factual questions | — | 13.2% |
| Price per million tokens | ||
| Input | — | $1.00 |
| Output | — | $5.00 |
| Cached input | — | $0.10 |
| Blended (3:1) | — | $2.00 |
| Long-context rate | — | Same rate |
| Price source | — | Official Anthropic API |
| Limits | ||
| Context window | 200,000 tokens | 200,000 tokens |
| Max output | 8,192 tokens | 64,000 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | Yes | Yes |
| Audio | No | No |
| Video | No | No |
| Reasoning | No | Yes |
| Tool calling | Yes | Yes |
| Structured output | No | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | — | claude-haiku-4-5 |
| API providers | — | 34 |
| Released | Oct 22, 2024 | Oct 15, 2025 |
| Knowledge cutoff | Jul 31, 2024 | Feb 28, 2025 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Claude Haiku 3.5—
- Claude Haiku 4.5$20.00
Which should you choose?
Which is better: Claude Haiku 3.5 or Claude Haiku 4.5?
Claude Haiku 4.5 is the better all-round choice, scoring 66/100 against Claude Haiku 3.5 (49). It leads on capability and inputs & features. The score weighs capability 67%, inputs & features 20%, context window 13%.
Which is cheaper, Claude Haiku 3.5 or Claude Haiku 4.5?
Claude Haiku 4.5 is cheaper at $1.00 input / $5.00 output per million tokens (official Anthropic API price). . At a typical mix of three input tokens to one output token, that is $2.00 per million tokens for Claude Haiku 4.5 versus . Claude Haiku 3.5 has no published per-token price.
Which scores higher on benchmarks?
Claude Haiku 4.5 scores higher on the Capabilities Index (ECI): Claude Haiku 4.5 142.4 (#90 of 148) and Claude Haiku 3.5 127.2 (#134 of 148). Their confidence ranges do not overlap (139.5–144.3 vs 120.7–129.7), so the gap is a real one. On individual benchmarks: GPQA Diamond — Claude Haiku 4.5 71.2%, Claude Haiku 3.5 38.1%; OTIS Mock AIME 2024–2025 — Claude Haiku 4.5 66.7%, Claude Haiku 3.5 4.3%.
Which is better for coding?
There are no published SWE-bench Verified results for Claude Haiku 3.5 and Claude Haiku 4.5 yet, so there is no like-for-like coding score. On overall capability, Claude Haiku 4.5 leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.
Which has the bigger context window?
Claude Haiku 3.5 and Claude Haiku 4.5 share the same 200,000-token context window. Maximum output per response: Claude Haiku 3.5 up to 8,192, Claude Haiku 4.5 up to 64,000 tokens.
Which can read images, PDFs, audio or video?
Claude Haiku 3.5 accepts text, images and PDFs; Claude Haiku 4.5 accepts text, images and PDFs. They handle the same number of input types.
Are any of these open source?
No. Claude Haiku 3.5 and Claude Haiku 4.5 are proprietary and only available through APIs and apps.
Which is newer?
Claude Haiku 4.5 is the newest, released Oct 15, 2025. Claude Haiku 3.5 came out Oct 22, 2024. Knowledge cutoff: Claude Haiku 3.5 Jul 31, 2024, Claude Haiku 4.5 Feb 28, 2025.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
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