Claude 4.5 Haiku (Reasoning) vs GPT-5.1 (high): The Ultimate Performance & Pricing Comparison

Deep dive into reasoning, benchmarks, and latency insights.

The Final Verdict in the Claude 4.5 Haiku (Reasoning) vs GPT-5.1 (high) Showdown

After a comprehensive analysis, GPT-5.1 (high) emerges as the superior choice for users prioritizing raw intelligence and reasoning. However, Claude 4.5 Haiku (Reasoning) remains a highly competitive option, especially for scenarios demanding faster response times and cost-efficiency. This detailed Claude 4.5 Haiku (Reasoning) vs GPT-5.1 (high) comparison will break down every critical metric to help you make the best decision.

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Model Snapshot

Key decision metrics at a glance.

Claude 4.5 Haiku (Reasoning)

Anthropic

Reasoning: 8
Coding: 3
Multimodal: 3
Long Context: 5
Blended Price / 1M tokens: $0.002
P95 Latency: 1000ms
Tokens per second: 103.774tokens/sec

GPT-5.1 (high)

OpenAI

Reasoning: 9
Coding: 4
Multimodal: 4
Long Context: 6
Blended Price / 1M tokens: $0.003
P95 Latency: 1000ms
Tokens per second: 140.286tokens/sec

Overall Capabilities

The capability radar provides a holistic view of the Claude 4.5 Haiku (Reasoning) vs GPT-5.1 (high) matchup. This chart illustrates each model's strengths and weaknesses at a glance, forming a cornerstone of our Claude 4.5 Haiku (Reasoning) vs GPT-5.1 (high) analysis.

This radar chart visually maps the core capabilities (reasoning, coding, math proxy, multimodal, long context) of `Claude 4.5 Haiku (Reasoning)` vs `GPT-5.1 (high)`.

Benchmark Breakdown

For a granular look, this chart directly compares scores across standardized benchmarks. In the critical MMLU Pro test, a key part of the Claude 4.5 Haiku (Reasoning) vs GPT-5.1 (high) debate, Claude 4.5 Haiku (Reasoning) scores 80 against GPT-5.1 (high)'s 90. This data-driven approach is essential for any serious Claude 4.5 Haiku (Reasoning) vs GPT-5.1 (high) comparison.

This grouped bar chart provides a side-by-side comparison for each benchmark metric.

Speed & Latency

Speed is a crucial factor in the Claude 4.5 Haiku (Reasoning) vs GPT-5.1 (high) decision for interactive applications. The metrics below highlight the trade-offs you should weigh before shipping to production.

Time to First Token

Claude 4.5 Haiku (Reasoning)300ms

GPT-5.1 (high)300ms

Tokens per Second

Claude 4.5 Haiku (Reasoning)103.774

GPT-5.1 (high)140.286

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The Economics of Claude 4.5 Haiku (Reasoning) vs GPT-5.1 (high)

Power is only one part of the equation. This Claude 4.5 Haiku (Reasoning) vs GPT-5.1 (high) pricing analysis gives you a true sense of value.

Pricing Breakdown

Compare input and output pricing at a glance.

Real-World Cost Scenario

To process 1M input tokens and generate 250k output tokens, Claude 4.5 Haiku (Reasoning) would cost $0.002, whereas GPT-5.1 (high) would cost $0.004. This practical calculation is vital for any developer considering the Claude 4.5 Haiku (Reasoning) vs GPT-5.1 (high) choice.

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Which Model Wins the Claude 4.5 Haiku (Reasoning) vs GPT-5.1 (high) Battle for You?

Choose Claude 4.5 Haiku (Reasoning) if...

Your top priority is raw performance and capability.

You need the most advanced reasoning capabilities available.

Your use case demands cutting-edge AI performance.

Choose GPT-5.1 (high) if...

You are developing at scale where operational costs are critical.

You prioritize cost-effectiveness over maximum performance.

Your workload requires consistent, reliable performance.

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Your Questions about the Claude 4.5 Haiku (Reasoning) vs GPT-5.1 (high) Comparison

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Data source: https://artificialanalysis.ai/