Model comparison

vs

Claude Sonnet 5.5 vs GPT-6.1 Sol

Anthropic against OpenAI, compared on listed price, real workload cost, context and capabilities.

The short answer

  • Claude Sonnet 5.5 and GPT-6.1 Sol list the same input and output prices.

Side-by-side specs

SpecClaude Sonnet 5.5GPT-6.1 Sol
ProviderAnthropicOpenAI
Input price$2/M$2/M
Output price$10/M$10/M
Cached input$0.1/M$0.1/M
Blended price (3:1)$4/M$4/M
Context window1M tokens1M tokens
Max output128k tokens128k tokens
InputText, ImagesText, Images
Structured outputYesYes
WeightsClosedClosed
ReleasedSeptember 28, 2026September 29, 2026

Same work, both models

WorkloadClaude Sonnet 5.5GPT-6.1 Sol
One chat reply3,000 tokens in, 500 outSame$0.01$0.01
Summarise a 100-page report50,000 tokens in, 1,500 out, one request$0.12$0.12
1,000 classification calls500 tokens in, 20 out, per call$1.20$1.20
Coding-agent session2M tokens in across ~60 turns, 60,000 out, no cache$4.60$4.60
Same session, cached85% of input read from the prompt cache, the rest written to it$1.52$1.52

At listed rates. Token counts are typical sizes, not measurements.

Claude Sonnet 5.5 pricing notes

  • The full 1M-token window bills at the standard rate, with no long-context surcharge.
  • Cache writes bill at $2.50 per 1M tokens (5-minute tier); cache hits at $0.10, half Sonnet 5's $0.20.

GPT-6.1 Sol pricing notes

  • Requests over 272K input tokens bill the entire request at 2x the input and cache rates and 1.5x the output rate; the listed price is the short-context rate.
  • Cache hits bill at $0.10 per 1M tokens, half GPT-6 Sol's $0.20; cache writes cost $2.50 (30-minute) or $5.00 (12-hour).

When to pick which

Claude Sonnet 5.5

Anthropic's mid-tier Claude model, which Anthropic describes as its best combination of speed and intelligence. It succeeds Sonnet 5 at the same $2 / $10 rate, with a 1M-token context and half the cache-read price, and sits below Opus 5.5.

Pick it if

  • you want Claude at half of Opus 5.5's per-token price
  • you resend long prompts; cache hits bill at 5% of input
  • your prompts need a 1M-token window at the standard rate

Skip it if

  • Haiku 5.5 handles your high-volume classification or routing more cheaply
  • your code forces tool use or sets temperature; both return errors

GPT-6.1 Sol

OpenAI's GPT-6.1 Sol, for complex coding and professional work, replaced GPT-6 Sol at the same $2 / $10 rate with half Sol's cache-hit price. It sits below GPT-6 Astra and above GPT-6 Luna in price.

Pick it if

  • you want complex coding work at one-fifth of GPT-6 Astra's token price
  • you resend long prompts; cache hits bill at 5% of input
  • your prompts mix text and images

Skip it if

  • GPT-6 Luna at $0.10 / $0.50 covers your workload
  • your prompts often pass 272K input tokens; the whole request then bills higher

FAQ

Which is cheaper, Claude Sonnet 5.5 or GPT-6.1 Sol?

Claude Sonnet 5.5 and GPT-6.1 Sol list the same input and output prices. On a coding-agent session (2M tokens in, 60,000 out) Claude Sonnet 5.5 costs $4.60 and GPT-6.1 Sol $4.60.

Can I switch between Claude Sonnet 5.5 and GPT-6.1 Sol mid-task?

Yes. In an Octomind session, /model octohub:claude-sonnet-5-5 and /model octohub:gpt-6.1-sol switch models without losing the conversation, so you can draft on one and review on the other.

Try either model

Switch between models inside the same Octomind session.

Prices from the catalog of 2026-10-31