modelgrep

Anthropic: Claude Sonnet 5 vs OpenAI: GPT-5.6 Terra

anthropic logoAnthropic: Claude Sonnet 5anthropic/claude-sonnet-5VSopenai logoOpenAI: GPT-5.6 Terraopenai/gpt-5.6-terra

OpenAI: GPT-5.6 Terra wins on more metrics (6 of 9), but the right pick depends on what you optimize for — see the breakdown below.

MetricAnthropic: Claude Sonnet 5OpenAI: GPT-5.6 Terra
Intelligence Index53.455.0✓
Coding Index71.576.7✓
GPQA Diamond91%93%✓
Design Arena Elo1322✓—
Speed (tokens/sec)6187✓
Latency2.0s1.7s✓
Input price /M$2.00✓$2.50
Output price /M$10.00✓$15.00
Context window1M1.1M✓
CapabilitiesReasoningToolsJSONVisionReasoningToolsJSONVision
Anthropic: Claude Sonnet 5 details →OpenAI: GPT-5.6 Terra details →