modelgrep

Anthropic: Claude Opus 4.8 vs OpenAI: GPT-5.6 Terra

anthropic logoAnthropic: Claude Opus 4.8anthropic/claude-opus-4.8VSopenai logoOpenAI: GPT-5.6 Terraopenai/gpt-5.6-terra

OpenAI: GPT-5.6 Terra wins on more metrics (5 of 9), but the right pick depends on what you optimize for — see the breakdown below.

MetricAnthropic: Claude Opus 4.8OpenAI: GPT-5.6 Terra
Intelligence Index55.7✓55.0
Coding Index74.376.7✓
GPQA Diamond92%93%✓
Design Arena Elo1288✓—
Speed (tokens/sec)106✓87
Latency1.1s✓1.7s
Input price /M$5.00$2.50✓
Output price /M$25.00$15.00✓
Context window1M1.1M✓
CapabilitiesReasoningToolsJSONVisionReasoningToolsJSONVision
Anthropic: Claude Opus 4.8 details →OpenAI: GPT-5.6 Terra details →