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Claude Haiku 4.5 vs O3 Mini

The readout for Claude Haiku 4.5 and O3 Mini, before the detailed comparison sheet.

Model A

Claude Haiku 4.5

Anthropic

Leading
vs

Model B

O3 Mini

OpenAI

Contender

Key Takeaways

Weighted outcome: Claude Haiku 4.5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

Claude Haiku 4.5

Claude Haiku 4.5 has the higher weighted result; Model A / B score 60 to 40.

Evidence depth

85 data points

Includes 10 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with Claude Haiku 4.5

The charts below split 20 high-signal samples across speed, scores, and audit health.

Change comparison

Switch either side of this report to compare another model with the same LMSpeed data pipeline.

Select a different model to open a new comparison URL.

Comparison sheet

This report only uses LMSpeed data for Claude Haiku 4.5 and O3 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
Claude Haiku 4.5
O3 Mini
Overall leaderLeadingContender
Weighted overall score60.0 pts40.0 pts
Benchmark category leads2 categories2 categories
Operational advantagesCheapest input price, Average speed, First-token latency, Free providers, Provider coverageNo data
Context window200K tokens200K tokens
Max output64K tokens100K tokens
Modalities

Input

TextImageFile

Output

Text

Input

TextFile

Output

Text
Features
Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning
Text inputFile inputText outputTool callingStructured outputsJSON modeReasoning

The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.

Model metadata

Model compare
Claude Haiku 4.5
O3 Mini
DeveloperAnthropicOpenAI
ReleasedOct 2025Feb 2025
ParametersNo dataNo data
TokenizerClaudeGPT
Knowledge cutoffNo data2023-10-31
OpenRouter IDanthropic/claude-haiku-4.5openai/o3-mini
ReferencesNo dataNo data

When to choose each model

This report only uses LMSpeed data for Claude Haiku 4.5 and O3 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Claude Haiku 4.5

Claude Haiku 4.5 is stronger in benchmark categories (Agents, Coding) and operational dimensions (Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage).

O3 Mini

O3 Mini leads these benchmark categories: Reasoning, Math.

Benchmark score comparison

Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.

Category performance

Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.

Model A coverage
4 / 8
Model B coverage
6 / 8
Shared
4 shared categories

Avg. score

Claude Haiku 4.5

45.6

Avg. score

O3 Mini

48.3

Agents

Claude Haiku 4.5 leads by 3.6

Claude Haiku 4.543
O3 Mini39.4

Coding

Claude Haiku 4.5 leads by 7.5

Claude Haiku 4.546.7
O3 Mini39.2

Reasoning

O3 Mini leads by 1.9

Claude Haiku 4.547.4
O3 Mini49.3

Knowledge

O3 Mini

Claude Haiku 4.5-
O3 Mini47.8

Math

O3 Mini leads by 13.1

Claude Haiku 4.545.4
O3 Mini58.5

Multilingual

No data

Claude Haiku 4.5-
O3 Mini-

Multimodal

No data

Claude Haiku 4.5-
O3 Mini-

Instruction following

O3 Mini

Claude Haiku 4.5-
O3 Mini55.6

Professional benchmark details

Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.

Aggregatereported

BenchLM overall score

SourceClaude Haiku 4.5

Claude Haiku 4.5

winner

55.0

Rank #66/111 · confidence 1 · eval date 2025-10-15

+4.0

O3 Mini

51.0

Rank #78/111 · confidence 1 · eval date 2025-01-31

Pricingverified

Input price

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

winner

$1.00/M

Rank #113/186 · confidence 4

+$0.100/M

O3 Mini

$1.10/M

Rank #117/186 · confidence 4

Pricingverified

Blended price

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

$2.00/M

Rank #121/186 · confidence 4

+$0.075/M

O3 Mini

winner

$1.93/M

Rank #118/186 · confidence 4

Pricingverified

Output price

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

$5.00/M

Rank #127/186 · confidence 4

+$0.600/M

O3 Mini

winner

$4.40/M

Rank #119/186 · confidence 4

Reasoningverified

MMLU-Pro

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

winner

80.0%

Rank #63/129 · confidence 4

+0.9%

O3 Mini

79.1%

Rank #70/129 · confidence 4

Reasoningverified

GPQA

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

64.6%

Rank #158/218 · confidence 4

+10.2%

O3 Mini

winner

74.8%

Rank #122/218 · confidence 4

Reasoningverified

HLE

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

4.2%

Rank #177/216 · confidence 4

+3.7%

O3 Mini

winner

7.9%

Rank #135/216 · confidence 4

Codingverified

LiveCodeBench

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

51.1%

Rank #59/115 · confidence 4

+20.6%

O3 Mini

winner

71.7%

Rank #27/115 · confidence 4

Codingreported

SWE-bench Verified

SourceClaude Haiku 4.5

Claude Haiku 4.5

winner

73.3

Rank #38/49 · confidence 1 · eval date 2025-10-15

+24.0

O3 Mini

49.3

Rank #46/49 · confidence 1 · eval date 2025-01-31

Codingreported

BenchLM Coding score

SourceClaude Haiku 4.5

Claude Haiku 4.5

winner

54.2

Rank #41/87 · confidence 1 · eval date 2025-10-15

+32.9

O3 Mini

21.3

Rank #86/87 · confidence 1 · eval date 2025-01-31

API audit comparison

Latest completed audits from shared providers, with four safety and integrity score groups plus report links.

Provider
Claude Haiku 4.5
O3 Mini
No completed audits are available from shared providers yet.

Provider examples

Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.

Provider
Claude Haiku 4.5
O3 Mini
丸美小沐25 tests

Claude Haiku 4.5

speed / latency

N/A / N/A

input / output

No data

O3 Mini

speed / latency

66 tok/s / 6491ms

input / output

No data

N1N20 tests

Claude Haiku 4.5

speed / latency

112 tok/s / 1733ms

input / output

No data

O3 Mini

speed / latency

117 tok/s / 4809ms

input / output

No data

ZetaTechs API6 tests

Claude Haiku 4.5

speed / latency

N/A / N/A

input / output

No data

O3 Mini

speed / latency

44 tok/s / 17418ms

input / output

No data

My Claude Code5 tests

Claude Haiku 4.5

speed / latency

109 tok/s / 2221ms

input / output

No data

O3 Mini

speed / latency

N/A / N/A

input / output

No data

Rnglg2 API5 tests

Claude Haiku 4.5

speed / latency

160 tok/s / 2639ms

input / output

No data

O3 Mini

speed / latency

N/A / N/A

input / output

No data

兔子API

Claude Haiku 4.5

claude-haiku-4-5

speed / latency

No data

input / output

$0/request

O3 Mini

o3-mini-medium

speed / latency

No data

input / output

$0/request

Newagiai

Claude Haiku 4.5

claude-haiku-4-5-20251001

speed / latency

No data

input / output

$0.110/M/$0.548/M

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0033/request

柏拉图AI

Claude Haiku 4.5

claude-haiku-4-5-20251001

speed / latency

No data

input / output

$0.110/M/$0.548/M

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0033/request

KKSJ-AI

Claude Haiku 4.5

claude-haiku-4-5-20251001

speed / latency

No data

input / output

$0.123/M/$0.616/M

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0062/request

PoloAPI

Claude Haiku 4.5

claude-haiku-4-5-c

speed / latency

No data

input / output

$0.027/request

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0095/request

FAQ

Weighted outcome: Claude Haiku 4.5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Why is this comparison indexable?
It has 6 verifiable comparison points, and both models have pricing or benchmark data.
Are missing metrics invented?
No. Metrics without LMSpeed data are omitted from this report.

Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.