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Claude Sonnet 5.5 vs GPT-6.1 Sol

The same tier from two labs, released a day apart. Sonnet 5.5 is the faster everyday worker and posted the best Terminal-Bench 4.0 score in Anthropic’s lineup; GPT-6.1 Sol is closer to a flagship on agents that operate software. Both are brand new, so test them on your own prompts.

Try both on one keySee every model’s rate

Choose Claude Sonnet 5.5 if

  • Everyday coding, bug fixing and command-line agents — Sonnet scored 70.6% on Terminal-Bench 4.0.
  • Documents, slides and spreadsheets.
  • Thinking you can dial back for speed.
About Claude Sonnet 5.5

Choose GPT-6.1 Sol if

  • Agents that click through web pages and desktop apps.
  • Science and terminal work, which OpenAI benchmarks at a low cost per task.
  • The closest thing to Astra at a mid-tier rate.
About GPT-6.1 Sol

Side by side

Claude Sonnet 5.5GPT-6.1 Sol
Made byAnthropicOpenAI
ReleasedSeptember 2026September 2026
Input price, per 1M tokensS$2.68S$2.68
Output price, per 1M tokensS$13.39S$13.39
Cached input, per 1M tokensS$0.2678S$0.1339
Batch (about half price)YesYes
Context window1M tokens1.05M tokens
Longest answer128K tokens128K tokens
ReadsText, Images, PDFsText, Images
Thinks before answeringYes, adjustableAlways on
Open weightsNoNo

Prices are Roar AI’s published rates, live from our price list. Specs are each lab’s own published figures. Prices are our published US dollar rates converted at S$1.30 to the dollar, our rate for October — the same rate your card is charged.

What a real job costs

Take 1,000 requests, each about 3,000 tokens in and 1,000 out — a long prompt and a page of answer.

Claude Sonnet 5.5S$21.42
GPT-6.1 SolS$21.42

The two cost about the same for this job. Models that think before answering spend extra output tokens doing it, so on hard prompts the real gap can be wider than the rates suggest.

Use both, switch any time

On Roar AI both are on the same key and the same monthly invoice, paid in your local currency. Trying the other one is a one-word change:

client.chat.completions.create(model="claude-sonnet-5-5", …)
client.chat.completions.create(model="gpt-6.1-sol", …)

Send the same prompts to both for a day and compare the answers on your own work — that settles it faster than any benchmark. Read the docs.

More head-to-heads

Claude Sonnet 5.5 vs Claude Opus 5.5Head to headClaude Sonnet 5.5 vs Gemini 3.8 FlashHead to headGPT-5.3-Codex vs Claude Sonnet 5.5Head to headKimi K3 vs Claude Sonnet 5.5Head to headClaude Opus 5.5 vs GPT-6.1 SolHead to headGPT-6.1 Sol vs GPT-6 AstraHead to head

Try both
on one key

Send the same prompts to each and compare the answers on your own work.

Get startedRead the docs