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Anthropic

Claude Haiku 4.5

Released Oct 15, 2025 · knowledge cutoff 2025-02

Status
Superseded
Location
United States
Type
LLM
Modality
Multimodal
Context window
200K
Max output
64K
Speed
—
Price ($/MTok in / out)
$1 / $5
Cost per task
$0.24
Open weights
No
Benchmarks5 of 10 reported

GPQA Diamond

73%

SWE-bench Verified

73.3%

SWE-bench Pro

39.45%

AIME (latest)retired

83%

LMArena Elo

1405

MMLU-Proretired

—

Terminal-Bench 2.1

—

Humanity's Last Exam

—

GDPval-AA v2

—

ARC-AGI-2

—
Strengths & weaknesses

Strengths

  • Fast enough for autocomplete, classification and anything where latency is the product
  • Small, but can still think before answering — unusual at this size
  • Cheap enough to run many copies in parallel as sub-agents under a larger model

Weaknesses

  • Loses the thread on long tasks; needs a bigger model to plan for it and check it
  • Takes instructions literally and misses implied requirements

Anthropic's current small model. SWE-bench Pro 39.45% is Scale's public-set leaderboard figure for claude-4-5-haiku — third-party, not Anthropic-reported.

For developers

API model strings

  • anthropicclaude-haiku-4-5-20251001
  • aws-bedrockanthropic.claude-haiku-4-5
  • aws-bedrockanthropic.claude-haiku-4-5-20251001-v1:0
  • google-vertexclaude-haiku-4-5@20251001

Licence

Proprietary — weights not released

Retirement

No retirement announced

Lineage

No recorded predecessor

News