GPT-5 vs Grok 4.3

Pick two tools from the same category to compare side-by-side.

	GPT-5 OpenAI's frontier model; broad capability, strong tool use.	Grok 4.3 xAI's flagship API model, billed as its most intelligent and fastest, with strong agentic tool calling.
Category	model	model
Vendor type	commercial	commercial
Pricing	usage	usage
Strengths	+ First-class integration with OpenAI Agents SDK and Codex CLI + Broad ecosystem of tooling and integrations	+ Aggressive pricing ($1.25 input / $2.50 output per million tokens) for a 1M-context flagship + Vendor-reported leadership in agentic tool calling and instruction following + Companion multi-agent variant (grok-4.20-multi-agent) targeted at agentic workloads
Tradeoffs	− Lock-in to OpenAI platform features (e.g., Responses API)	− Stated knowledge cutoff of November 2024 is older than competing flagships − Rapid model churn; xAI retired eight legacy models (including grok-3) in May 2026, so pinned integrations need active migration
Used in stacks	0	0