Claude Haiku 4.5 vs Claude Sonnet 4.5
Claude Haiku 4.5 (2025) and Claude Sonnet 4.5 (2025) are frontier reasoning models from Anthropic. Claude Haiku 4.5 ships a 200k-token context window, while Claude Sonnet 4.5 ships a 200k-token context window. On SWE-bench Verified, Claude Sonnet 4.5 leads by 3.9 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Claude Haiku 4.5 is safer overall; choose Claude Sonnet 4.5 when reasoning depth matters.
Decision scorecard
Local evidence first| Signal | Claude Haiku 4.5 | Claude Sonnet 4.5 |
|---|---|---|
| Best for | multimodal apps, tool-calling agents, and provider-routed production | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 200k | 200k |
| Cheapest output | $4/1M tokens | $15/1M tokens |
| Provider routes | 8 tracked | 8 tracked |
| Shared benchmarks | 2 rows | SWE-bench Verified leader |
Decision tradeoffs
- Claude Haiku 4.5 has the lower cheapest tracked output price at $4/1M tokens.
- Claude Haiku 4.5 uniquely exposes Code execution in local model data.
- Local decision data tags Claude Haiku 4.5 for Coding, RAG, and Agents.
- Claude Sonnet 4.5 holds a shared-benchmark lead on SWE-bench Verified, ahead by 3.9 points.
- Claude Sonnet 4.5 uniquely exposes Reasoning in local model data.
- Local decision data tags Claude Sonnet 4.5 for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Claude Haiku 4.5
$1,640
Cheapest tracked route/tier: AWS Bedrock
Claude Sonnet 4.5
$6,150
Cheapest tracked route/tier: Microsoft Foundry
Estimated monthly gap: $4,510. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on Microsoft Foundry, Anthropic, and Snowflake Cortex; start route-level A/B tests there.
- Claude Sonnet 4.5 is $11/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Code execution before moving production traffic.
- Claude Sonnet 4.5 adds Reasoning in local capability data.
- Provider overlap exists on Microsoft Foundry, Anthropic, and Snowflake Cortex; start route-level A/B tests there.
- Claude Haiku 4.5 is $11/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning before moving production traffic.
- Claude Haiku 4.5 adds Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-10-01 | 2025-09-29 |
| Context window | 200k | 200k |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Commercial use | Commercial use with conditions | Commercial use with conditions |
| Knowledge cutoff | 2025-02 | 2025-12 |
Pricing and availability
| Pricing attribute | Claude Haiku 4.5 | Claude Sonnet 4.5 |
|---|---|---|
| Input price | $0.80/1M tokens |
|
| Output price | $4/1M tokens |
|
| Providers |
Capabilities
| Capability | Claude Haiku 4.5 | Claude Sonnet 4.5 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | No | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Claude Haiku 4.5 | Claude Sonnet 4.5 |
|---|---|---|
| SWE-bench Verified | 73.3 | 77.2 |
| BFCL | 68.7 | 73.2 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has Claude Haiku 4.5 at 73.3 and Claude Sonnet 4.5 at 77.2, with Claude Sonnet 4.5 ahead by 3.9 points; BFCL has Claude Haiku 4.5 at 68.7 and Claude Sonnet 4.5 at 73.2, with Claude Sonnet 4.5 ahead by 4.5 points. The largest visible gap is 4.5 points on BFCL, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on reasoning mode: Claude Sonnet 4.5 and code execution: Claude Haiku 4.5. Both models share vision, multimodal input, function calling, and tool use, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Claude Haiku 4.5 lists $0.80/1M input and $4/1M output tokens on the cheapest tracked provider, while Claude Sonnet 4.5 lists tiered pricing: 0-200,001t is $3/1M input and $15/1M output; 200,001t+ is $6/1M input and $22.50/1M output. A 70/30 input-output blend puts Claude Haiku 4.5 lower by about $4.84 per million blended tokens. For tiered rows, this cheapest-track view can understate interactive or fast-lane spend, so compare the tier you will actually use. Availability is 8 providers versus 8, so concentration risk also matters.
Choose Claude Haiku 4.5 when coding workflow support and lower input-token cost are central to the workload. Choose Claude Sonnet 4.5 when reasoning depth are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, Claude Haiku 4.5 or Claude Sonnet 4.5?
Claude Haiku 4.5 supports 200k tokens, while Claude Sonnet 4.5 supports 200k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Claude Haiku 4.5 or Claude Sonnet 4.5?
Claude Haiku 4.5 lists $0.80/1M input and $4/1M output tokens on the cheapest tracked provider. Claude Sonnet 4.5 lists tiered pricing: 0-200,001t is $3/1M input and $15/1M output; 200,001t+ is $6/1M input and $22.50/1M output. Compare the tier you will actually use; cheap async pricing can overstate savings for interactive workflows. Provider discounts or batch pricing can still change the final bill.
Is Claude Haiku 4.5 or Claude Sonnet 4.5 open source?
Claude Haiku 4.5 is listed under Proprietary. Claude Sonnet 4.5 is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude Haiku 4.5 or Claude Sonnet 4.5?
Both Claude Haiku 4.5 and Claude Sonnet 4.5 expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, Claude Haiku 4.5 or Claude Sonnet 4.5?
Both Claude Haiku 4.5 and Claude Sonnet 4.5 expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run Claude Haiku 4.5 and Claude Sonnet 4.5?
Claude Haiku 4.5 is available on Microsoft Foundry, Anthropic, Snowflake Cortex, AWS Bedrock, and GCP Vertex AI. Claude Sonnet 4.5 is available on Microsoft Foundry, Anthropic, Snowflake Cortex, GCP Vertex AI, and AWS Bedrock. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-25. Data sourced from public model cards and provider documentation.