AnthropicClaude Opus 4.8VSOpenAIGPT-5.6 Terra

Analysis by:the whichllmmodel Editorial Team|Updated: June 2026

Our Take

If your budget allows, Claude Opus 4.8 is the superior choice here, offering a clear benchmark advantage while carrying only a moderate price premium (1.8x). We recommend choosing GPT-5.6 Terra only if you need to optimize costs for very high-volume pipelines.

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Model Specs

Claude Opus 4.8

Website

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+5.8%)

69.2%

excellent at multi-file repositories, autonomous agents, and industrial codebases

Reasoning (gpqa-diamond)Winner (+0.7%)

93.6%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)

$10.00Input: $5.00 | Output: $25.00

Context Window

1.05M tokens

Model Specs

GPT-5.6 Terra

Website

Benchmarks & Scores

Coding (swe-bench-pro)

63.4%

excellent at multi-file repositories, autonomous agents, and industrial codebases

Reasoning (gpqa-diamond)

92.9%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)1.8x cheaper

$5.63Input: $2.50 | Output: $15.00

Context WindowLarger

1.05M tokens

Read our data collection methodology

Frequently Asked Questions about Claude Opus 4.8 vs GPT-5.6 Terra

GPT-5.6 Terra is cheaper than Claude Opus 4.8. GPT-5.6 Terra has a blended cost of $5.63/1M tokens, which is about 1.8x cheaper than Claude Opus 4.8 at $10.00/1M tokens.

Claude Opus 4.8 is better for coding tasks on this benchmark. It scores 69.2% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases) compared to GPT-5.6 Terra which scores 63.4%.

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