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Claude Haiku 4.5 vs GPT 5.3 Codex

At a glance

Fast and efficient with near-frontier intelligence.

75200K ctx$1.00/$5.00 per M#41/92

OpenAI's most advanced agentic coding model with 400K context.

87400K ctx$1.75/$14.00 per M#8/92
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper58%
Capability
CapabilityECI75.3
Reasoning & Knowledge
Graduate Science60.5%
Math
Math Problems86.9%Competition Math35.8%Research Math4.1%
Coding
Real-World Coding—
Agentic
Terminal Tasks29.8%Novel Reasoning1.3%Task Horizon—
Reasoning
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter16%
Capability
CapabilityECI16%87.0
Reasoning & Knowledge
Graduate Science—
Math
Math Problems—Competition Math—Research Math—
Coding
Real-World Coding74.8%
Agentic
Terminal Tasks163%78.4%Novel Reasoning—Task Horizon5.8h
Specs
200K
Context
64K
Max output
Oct 2025
Released
400K
Context
128K
Max output
Feb 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input43%$1.00/M tokens
Output64%$5.00/M tokens
Cache read43%$0.10/M tokens
Cache write$1.25/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$1.75/M tokens
Output$14.00/M tokens
Cache read$0.17/M tokens
Web search$0.01/search
Chat with Claude Haiku 4.5Go to model
Chat with GPT 5.3 CodexGo to model
Frequently Asked Questions: Claude Haiku 4.5 vs GPT 5.3 Codex▼

Which is better, Claude Haiku 4.5 or GPT 5.3 Codex?

▼

Based on the Capability Index, GPT 5.3 Codex scores higher (87.0 vs 75.3). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, Claude Haiku 4.5 or GPT 5.3 Codex?

▼

Claude Haiku 4.5 has a lower blended cost. Claude Haiku 4.5: $1.00 input / $5.00 output. GPT 5.3 Codex: $1.75 input / $14.00 output.

Which has a larger context window, Claude Haiku 4.5 or GPT 5.3 Codex?

▼

GPT 5.3 Codex has a larger context window: Claude Haiku 4.5 supports 200K tokens vs GPT 5.3 Codex at 400K tokens.

Do both Claude Haiku 4.5 and GPT 5.3 Codex support vision?

▼

Yes, both Claude Haiku 4.5 and GPT 5.3 Codex support vision/image input.

What are the key differences between Claude Haiku 4.5 and GPT 5.3 Codex?

▼

Key differences: GPT 5.3 Codex has a notably higher capability index (11.7 point gap). Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Claude Haiku 4.5 and GPT 5.3 Codex for free on idapt.app to see which performs better for your specific needs.

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