Claude Haiku 4.5 vs Claude Sonnet 4.5
Benchmark Performance
Available Benchmarks
| Benchmark | Claude Haiku 4.5 | Claude Sonnet 4.5 |
|---|---|---|
| ARC-AGI-1verified-v1-15fb467fd4fc · verified_score · leader | 47.6775% of row best · percent · Claude Haiku 4.5 (Thinking 32K) | 63.67100% of row best · percent · Claude Sonnet 4.5 (Thinking 32K) |
| ARC-AGI-2verified-v2-9a3db289984e · verified_score · leader | 4.0330% of row best · percent · Claude Haiku 4.5 (Thinking 32K) | 13.61100% of row best · percent · Claude Sonnet 4.5 (Thinking 32K) |
| LMArena Document Arenadocument-2026-07-30-011508720696 · arena_rating · leader | 1,423.0398% of row best · rating · claude-haiku-4-5-20251001; 95% CI [1416.59570790, 1429.45877492]; votes 30937; rank 30 | 1,446.19100% of row best · rating · claude-sonnet-4-5-20250929; 95% CI [1439.60004073, 1452.78970477]; votes 28634; rank 22 |
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,395.2597% of row best · rating · claude-haiku-4-5-20251001; 95% CI [1392.70335168, 1397.78975878]; votes 124979; rank 144 | 1,433.95100% of row best · rating · claude-sonnet-4-5-20250929-high-32k; 95% CI [1431.13754052, 1436.75329939]; votes 81031; rank 79 |
| Overall ResultCounted from the protocol-matched rows above | 0 benchmark wins | 4 benchmark winsOverall lead |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Technical Differences
Side-by-Side Facts
| Field | Claude Haiku 4.5 | Claude Sonnet 4.5 |
|---|---|---|
| Developer | Anthropic | Anthropic |
| Family | Claude 4 5 | Claude 4 |
| Model | Claude Haiku 4.5 | Claude Sonnet 4.5 |
| Version | Claude Haiku 4.5 | Claude Sonnet 4.5 |
| Lifecycle | active | active |
| Released | 2025-10-15 | 2025-09-29 |
| Knowledge cutoff | Unknown | 2025-01-01 |
| Input modalities | Unknown | Unknown |
| Output modalities | Unknown | Unknown |
| Context window | 200,000 | 200,000 |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Anthropic (Standard), Deepinfra (Standard) | Anthropic (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, structured_outputs, tools |
12 comparable fields · 6 material differences · Interactive comparison only; indexing gate not met
Claude Haiku 4.5 Capabilities
Claude Sonnet 4.5 Capabilities
Primary Evidence
Sources and Freshness
Questions
Claude Haiku 4.5 vs Claude Sonnet 4.5 FAQs
Is Claude Haiku 4.5 or Claude Sonnet 4.5 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Haiku 4.5 and Claude Sonnet 4.5, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Haiku 4.5 or Claude Sonnet 4.5?+
Only Claude Haiku 4.5 has a directly sourced input price: $1.00 per million tokens. Only Claude Haiku 4.5 has a directly sourced output price: $5.00 per million tokens.
Which has a larger context window, Claude Haiku 4.5 or Claude Sonnet 4.5?+
Neither model has a larger sourced context window in this comparison. Claude Haiku 4.5 is 200,000 and Claude Sonnet 4.5 is 200,000.
Which performs better in benchmarks, Claude Haiku 4.5 or Claude Sonnet 4.5?+
Claude Sonnet 4.5 leads the current overall benchmark count. The result uses 4 protocol-matched benchmarks from 2 publishers; it is not a universal quality score.
Can Claude Haiku 4.5 or Claude Sonnet 4.5 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Haiku 4.5 is not marked open weight; Claude Sonnet 4.5 is not marked open weight.
Can Claude Haiku 4.5 and Claude Sonnet 4.5 understand images?+
Claude Haiku 4.5 is not documented with image input; Claude Sonnet 4.5 is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Haiku 4.5 or Claude Sonnet 4.5?+
Neither has a larger sourced maximum output. Claude Haiku 4.5 is 64,000 and Claude Sonnet 4.5 is 64,000.
Do Claude Haiku 4.5 and Claude Sonnet 4.5 support reasoning and tool use?+
Claude Haiku 4.5: reasoning and tool calling. Claude Sonnet 4.5: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Haiku 4.5 or Claude Sonnet 4.5?+
Claude Haiku 4.5 has 2 sourced provider routes; Claude Sonnet 4.5 has 1, so Claude Haiku 4.5 has broader tracked availability.
Which offers better value, Claude Haiku 4.5 or Claude Sonnet 4.5?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.