Model comparison Synced Apr 6, 2026

Anthropic: Claude 3.7 Sonnet (thinking) vs OpenAI: GPT-5.3 Chat

Side-by-side comparison of Anthropic: Claude 3.7 Sonnet (thinking) and OpenAI: GPT-5.3 Chat. Compare pricing, context window, capabilities, and find out which is better for your workflow.

Verdict

strong confidence

Anthropic: Claude 3.7 Sonnet (thinking) leads overall

Anthropic: Claude 3.7 Sonnet (thinking) leads in context window and capabilities and max output, making it the stronger choice for most workflows. OpenAI: GPT-5.3 Chat remains competitive with advantages in price.

Best for with Anthropic: Claude 3.7 Sonnet (thinking)

Long document processingMulti-modal tasksLong-form content generation

Best for with OpenAI: GPT-5.3 Chat

No clear advantages identified

Side-by-side

Technical specifications

	Anthropic: Claude 3.7 Sonnet (thinking)	OpenAI: GPT-5.3 Chat
Provider	Anthropic	OpenAI
Input price	$3/M	$2/M
Output price	$15/M	$14/M
Context window	200K	128K
Max output	64K	16K
Capabilities	Tool useVisionReasoning	Tool useVision
Released	Feb 24, 2025	Mar 3, 2026

View Anthropic: Claude 3.7 Sonnet (thinking) profile View OpenAI: GPT-5.3 Chat profile

Scoring breakdown