# Claude Sonnet 5.5 vs GPT-6 Astra

As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-6 Astra in 5 of 10 shared categories: Reasoning, Coding, Coding › Agentic, Long context, and Factuality.

Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.

GPT-6 Astra: $20 per 1M blended tokens.

Claude Sonnet 5.5: closed weights.

GPT-6 Astra: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, GPT-6 Astra leads Claude Sonnet 5.5 in General LLM at #26 against #29.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-6 Astra in Reasoning at #18 against #24.
- Which to pick, Math: As of Oct 15, 2026, GPT-6 Astra leads Claude Sonnet 5.5 in Math at #1 against #4.
- Which to pick, Science: As of Oct 15, 2026, GPT-6 Astra leads Claude Sonnet 5.5 in Science at #2 against #3.
- Which to pick, Coding: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-6 Astra in Coding at #1 against #2.
- Which to pick, Coding › Agentic: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-6 Astra in Coding › Agentic at #1 against #2.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, GPT-6 Astra leads Claude Sonnet 5.5 in Coding › Web dev at #2 against #3.
- Which to pick, Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-6 Astra in Long context at #11 against #25.
- Which to pick, Vision: As of Oct 15, 2026, Claude Sonnet 5.5 and GPT-6 Astra share #1 in Vision.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-6 Astra in Factuality at #17 against #29.

As of Oct 15, 2026, Claude Sonnet 5.5 is tied for state of the art in Coding (since Oct 6, 2026; sources Terminal-Bench 4.0; methodology v1.0).

As of Oct 15, 2026, GPT-6 Astra is state of the art in Math (since Sep 28, 2026; sources Humanity's Last Exam; methodology v1.0).