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

Deep dive into reasoning, benchmarks, and latency insights.

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

After a comprehensive analysis, GPT-5.1 Codex mini (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 GPT-5.1 Codex mini (high) vs Claude 4.5 Haiku (Reasoning) 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.

GPT-5.1 Codex mini (high)

OpenAI

Reasoning: 9
Coding: 4
Multimodal: 3
Long Context: 5
Blended Price / 1M tokens: $0.001
P95 Latency: 1000ms
Tokens per second: 74.764tokens/sec

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

Overall Capabilities

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

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

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 GPT-5.1 Codex mini (high) vs Claude 4.5 Haiku (Reasoning) debate, GPT-5.1 Codex mini (high) scores 90 against Claude 4.5 Haiku (Reasoning)'s 80. This data-driven approach is essential for any serious GPT-5.1 Codex mini (high) vs Claude 4.5 Haiku (Reasoning) comparison.

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

Speed & Latency

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

Time to First Token

GPT-5.1 Codex mini (high)300ms

Claude 4.5 Haiku (Reasoning)300ms

Tokens per Second

GPT-5.1 Codex mini (high)74.764

Claude 4.5 Haiku (Reasoning)103.774

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

Power is only one part of the equation. This GPT-5.1 Codex mini (high) vs Claude 4.5 Haiku (Reasoning) 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, GPT-5.1 Codex mini (high) would cost $0.001, whereas Claude 4.5 Haiku (Reasoning) would cost $0.002. This practical calculation is vital for any developer considering the GPT-5.1 Codex mini (high) vs Claude 4.5 Haiku (Reasoning) choice.

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

Choose GPT-5.1 Codex mini (high) if...

Your top priority is raw performance and capability.

You are working in a technical or scientific field requiring the highest accuracy.

You need the most advanced reasoning capabilities available.

Choose Claude 4.5 Haiku (Reasoning) 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 GPT-5.1 Codex mini (high) vs Claude 4.5 Haiku (Reasoning) Comparison

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Data source: https://artificialanalysis.ai/