Model Comparison

Claude 3.5 Haiku vs GPT-5.1 Codex High

Comparing Claude 3.5 Haiku and GPT-5.1 Codex High across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Claude 3.5 Haiku and GPT-5.1 Codex High don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Claude 3.5 Haiku costs less

For input processing, Claude 3.5 Haiku ($0.80/1M tokens) is 1.6x cheaper than GPT-5.1 Codex High ($1.25/1M tokens).

For output processing, Claude 3.5 Haiku ($4.00/1M tokens) is 2.5x cheaper than GPT-5.1 Codex High ($10.00/1M tokens).

In conclusion, GPT-5.1 Codex High is more expensive than Claude 3.5 Haiku.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Wed Apr 15 2026 • llm-stats.com
Anthropic
Claude 3.5 Haiku
Input tokens$0.80
Output tokens$4.00
Best providerAWS Bedrock
OpenAI
GPT-5.1 Codex High
Input tokens$1.25
Output tokens$10.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.1 Codex High accepts 400,000 input tokens compared to Claude 3.5 Haiku's 200,000 tokens. Claude 3.5 Haiku can generate longer responses up to 200,000 tokens, while GPT-5.1 Codex High is limited to 128,000 tokens.

Anthropic
Claude 3.5 Haiku
Input200,000 tokens
Output200,000 tokens
OpenAI
GPT-5.1 Codex High
Input400,000 tokens
Output128,000 tokens
Wed Apr 15 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5.1 Codex High supports multimodal inputs, whereas Claude 3.5 Haiku does not.

GPT-5.1 Codex High can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude 3.5 Haiku

Text
Images
Audio
Video

GPT-5.1 Codex High

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude 3.5 Haiku

Proprietary

Closed source

GPT-5.1 Codex High

Proprietary

Closed source

Release Timeline

When each model was launched

Claude 3.5 Haiku was released on 2024-10-22, while GPT-5.1 Codex High was released on 2025-11-12.

GPT-5.1 Codex High is 13 months newer than Claude 3.5 Haiku.

Claude 3.5 Haiku

Oct 22, 2024

1.5 years ago

GPT-5.1 Codex High

Nov 12, 2025

5 months ago

1.1yr newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Claude 3.5 Haiku is available from Bedrock, Google, Anthropic. GPT-5.1 Codex High is available from OpenAI.

Claude 3.5 Haiku

bedrock logo
AWS Bedrock
Input Price:Input: $0.80/1MOutput Price:Output: $4.00/1M
google logo
Google
Input Price:Input: $0.80/1MOutput Price:Output: $4.00/1M
anthropic logo
Anthropic
Input Price:Input: $1.00/1MOutput Price:Output: $5.00/1M

GPT-5.1 Codex High

openai logo
OpenAI
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Less expensive input tokens
Less expensive output tokens
OpenAI
Larger context window (400,000 tokens)
Supports multimodal inputs

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude 3.5 Haiku
OpenAI
GPT-5.1 Codex High

FAQ

Common questions about Claude 3.5 Haiku vs GPT-5.1 Codex High

Claude 3.5 Haiku (Anthropic) and GPT-5.1 Codex High (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.
Claude 3.5 Haiku scores HumanEval: 88.1%, MGSM: 85.6%, DROP: 83.1%, MATH: 69.4%, MMLU-Pro: 65.0%. GPT-5.1 Codex High scores AIME 2025: 96.7%.
Claude 3.5 Haiku is 1.6x cheaper for input tokens. Claude 3.5 Haiku costs $0.80/M input and $4.00/M output via bedrock. GPT-5.1 Codex High costs $1.25/M input and $10.00/M output via openai.
Claude 3.5 Haiku supports 200K tokens and GPT-5.1 Codex High supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (200K vs 400K), input pricing ($0.80 vs $1.25/M), multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.
Claude 3.5 Haiku is developed by Anthropic and GPT-5.1 Codex High is developed by OpenAI.