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Grok Build 0.1 vs GPT 5 Codex

At a glance
xAIGrok Build 0.1

xAI's agentic build model for autonomous software engineering.

256K ctx$1.00/$2.00 per M
OpenAIGPT 5 Codex

GPT-5 optimized for code generation and software engineering tasks.

400K ctx$1.25/$10.00 per M
AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
xAIGrok Build 0.1
Reasoning
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Provider·OpenRouter· as of 2026-06-15
Cheaper
Coding
Real-World Coding70.8%
Agentic
Terminal Tasks—
OpenAIGPT 5 Codex
Reasoning
CodingInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-07-10
Coding
Real-World Coding—
Agentic
Terminal Tasks44.3%
Specs
xAIGrok Build 0.1
256K
Context
16K
Max output
May 2026
Released
OpenAIGPT 5 Codex
400K
Context
128K
Max output
Sep 2025
Released
Capabilities
xAIGrok Build 0.1
Vision
Audio
Reasoning
OpenAIGPT 5 Codex
Vision
Audio
Reasoning
Pricing
xAIGrok Build 0.1
Live pricing, shown before you run
Input$1.00/M tokens
Output$2.00/M tokens
Cache read$0.20/M tokens
Web search$0.005/search
OpenAIGPT 5 Codex
Live pricing, shown before you run
Input$1.25/M tokens
Output$10.00/M tokens
Cache read$0.13/M tokens
Web search$0.01/search
Chat with Grok Build 0.1Go to model
Chat with GPT 5 CodexGo to model
Frequently Asked Questions: Grok Build 0.1 vs GPT 5 Codex▼

Which is better, Grok Build 0.1 or GPT 5 Codex?

▼

Both Grok Build 0.1 and GPT 5 Codex are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, Grok Build 0.1 or GPT 5 Codex?

▼

Grok Build 0.1 has a lower blended cost. Grok Build 0.1: $1.00 input / $2.00 output. GPT 5 Codex: $1.25 input / $10.00 output.

Which has a larger context window, Grok Build 0.1 or GPT 5 Codex?

▼

GPT 5 Codex has a larger context window: Grok Build 0.1 supports 256K tokens vs GPT 5 Codex at 400K tokens.

Do both Grok Build 0.1 and GPT 5 Codex support vision?

▼

Yes, both Grok Build 0.1 and GPT 5 Codex support vision/image input.

What are the key differences between Grok Build 0.1 and GPT 5 Codex?

▼

Grok Build 0.1 and GPT 5 Codex have similar overall capabilities. The main differences lie in pricing, context window size, and provider-specific strengths. Use this comparison page to review all metrics side by side.

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 Grok Build 0.1 and GPT 5 Codex for free on idapt.app to see which performs better for your specific needs.

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