GPT-6.1 Sol vs Claude Sonnet 5.5

GPT-6.1 Sol in brief

GPT-6.1 Sol specs and pricing: OpenAI's September 2026 value model at $2/$10 per million tokens with a 1.05M-token context, and how it compares with Claude Sonnet 5.5.

• Near-flagship quality at $2/$10
• Cached input at $0.10 per million tokens
• About 1.05M-token context

Claude Sonnet 5.5 in brief

Claude Sonnet 5.5 specs and pricing: Anthropic's September 2026 mid-tier model at $2/$10 per million tokens with a 1M-token context, compared with GPT-6.1 Sol and Gemini.

• Fast responses with strong reasoning
• 1M-token context and 128K output
• Same list price as GPT-6.1 Sol

Which should you choose?

Choose GPT-6.1 Sol if you need: production apps that need strong quality at scale; coding assistants and agents on a budget; high-volume document work.

Choose Claude Sonnet 5.5 if you need: customer-facing assistants that need speed; high-volume coding and data tasks; agents where latency matters.

For most teams the best test is your own workload: run the same 20–50 real prompts through both models and compare quality, speed and cost. Benchmarks published by labs use different settings and rarely match everyday use.