For most workflows, Claude Sonnet 5.5 is the stronger default — near-opus 5.5 quality on scoped work at half the price.
The safest Claude Sonnet 5.5 vs GPT-6.1 Sol default, the cheaper option worth trying first, and the specialist pick — before you read the detail below.
Claude Sonnet 5.5 is the strongest answer here for Claude Sonnet 5.5 vs GPT-6.1 Sol — pick it when quality of output matters more than the $2.00/1M/1M input you pay for it.
Claude Sonnet 5.5 is the cheaper way in for Claude Sonnet 5.5 vs GPT-6.1 Sol, at $2.00/1M/1M input against Claude Sonnet 5.5's $2.00/1M/1M.
GPT-6.1 Sol is the fastest of these for Claude Sonnet 5.5 vs GPT-6.1 Sol — worth it when latency is what the reader notices, not the last few points of reasoning depth.
Claude Sonnet 5.5 leads on coding with a score of 98 vs 98 for GPT-6.1 Sol.
GPT-6.1 Sol has the larger context window: 1.05M vs 1M for Claude Sonnet 5.5.
Both models are similarly priced — the decision comes down to capability, not cost.
Go with Claude Sonnet 5.5 if you want one model to handle coding and writing — it targets everyday feature work, bug fixing and polished documents at mid-tier pricing.
Switch to GPT-6.1 Sol when your work is mostly agentic coding and computer use when Astra's price is hard to justify; on that narrower brief it is the better tool.
Both models serve different primary workflows — Claude Sonnet 5.5 for everyday feature work and bug fixing and polished documents at mid-tier pricing, GPT-6.1 Sol for agentic coding and computer use when Astra's price is hard to justify — so running each where it has a clear edge often beats forcing one to do both.
Switch the scoring lens to see whether the Claude Sonnet 5.5 vs GPT-6.1 Sol answer changes when cost, speed, or long-document depth leads the decision.
Anthropic / Balanced / Oct 10, 2026
Near-Opus 5.5 quality on scoped work at half the price.
Ranks models by the broadest mix of coding, writing, research, and long-context usefulness.
The work is long, ambiguous and multi-step — Anthropic positions Opus 5.5 for exactly that — or you need the lowest possible price, where Haiku 5.5 costs a twentieth as much.
Where the Claude Sonnet 5.5 vs GPT-6.1 Sol recommendation shifts once you weigh price or latency differently.
Near-Opus 5.5 quality on scoped work at half the price.
Near-Astra capability at Sol pricing — OpenAI's value pick.
List prices and published scores — the numbers this page's pick is built from.
| Model | Input | Output | Est. month | Context | Speed | Coding | Writing | Research |
|---|---|---|---|---|---|---|---|---|
| Claude Sonnet 5.5Anthropic | $2.00/1M | $10.00/1M | $40 | 1M tokens | Fast | 98 | 98 | 95 |
| GPT-6.1 SolOpenAI | $2.00/1M | $10.00/1M | $40 | 1.1M tokens | Balanced | 98 | 94 | 97 |
Scores out of 100 — how we evaluate models. “Est. month” is 10M in / 2M out at list price: a ceiling, no discounts.
Why each one is on the shortlist for Claude Sonnet 5.5 vs GPT-6.1 Sol, what it is genuinely good at, and where we would steer you away from it.
Our pick for Claude Sonnet 5.5 vs GPT-6.1 Sol. It scores 98/100 on the coding axis we weight this page by, and nothing else in this shortlist matches it on output quality.
Anthropic's September 28, 2026 Sonnet — built for well-scoped everyday work like features, bug fixes, documents, slides and spreadsheets, priced at $2/$10 and close to Opus 5.5 on most of Anthropic's launch rows.
The work is long, ambiguous and multi-step — Anthropic positions Opus 5.5 for exactly that — or you need the lowest possible price, where Haiku 5.5 costs a twentieth as much.
The model most people should default to in the Claude lineup. Sonnet 5.5 lands within a few points of Opus 5.5 on most of Anthropic's launch rows, beats it on Terminal-Bench 4.0, and costs half as much. Step up to Opus 5.5 only when the task is open-ended and long.
Full pricing, benchmark table and release notes on the Claude Sonnet 5.5 page.
The fastest model in this shortlist for Claude Sonnet 5.5 vs GPT-6.1 Sol. Pick it when turnaround is what your readers or users notice.
OpenAI's September 29, 2026 DevDay release — a Sol-tier reasoning model that OpenAI says comes close to GPT-6 Astra on agentic coding, computer use and professional work at one fifth of Astra's price.
You need it inside ordinary ChatGPT chats today, or your prompts regularly pass 272K tokens where the rate doubles.
OpenAI's best value for serious work. GPT-6.1 Sol replaces both GPT-6 Sol and, for most teams, GPT-6 Astra: independent testing has it a point behind Astra at a fifth of the list price. Pick Astra only when the last point of capability is worth five times the bill.
Full pricing, benchmark table and release notes on the GPT-6.1 Sol page.
UseRightAI recommendations are based on practical decision factors people actually feel in day-to-day use.
Newsletter
We email when the Claude Sonnet 5.5 vs GPT-6.1 Sol pick changes, when one of these models moves on price, or when something new displaces the current leader.
No spam. Useful updates only. Affiliate disclosures always clearly labeled.
Claude Sonnet 5.5 wins on more of the categories we score — coding, writing, research — so it is the better default of the two. GPT-6.1 Sol is the better pick when your work is mostly agentic coding and computer use when Astra's price is hard to justify. Neither is universally "better": Claude Sonnet 5.5 is aimed at everyday feature work and bug fixing and polished documents at mid-tier pricing, GPT-6.1 Sol at agentic coding and computer use when Astra's price is hard to justify.
Both models are similarly priced at $2/1M input tokens. The decision should come down to capability, not cost.
GPT-6.1 Sol has the larger context window at 1.05M tokens vs Claude Sonnet 5.5's 1M. For large document analysis, GPT-6.1 Sol is the stronger pick.
Claude Sonnet 5.5 and GPT-6.1 Sol are similarly matched on coding. Claude Opus 5.5 is the overall coding leader in this directory at 100/100.
Claude Sonnet 5.5 is faster with a fast speed rating (score: 4) vs GPT-6.1 Sol's balanced rating (score: 3). Speed matters most for interactive and high-throughput work; for batch jobs the GPT-6.1 Sol latency penalty is usually invisible.
Anthropic itself says Opus 5.5 is better on loosely defined tasks that need longer reasoning. Trails Opus 5.5 on Humanity's Last Exam (64.5% vs 67.7%). Avoid it if the work is long, ambiguous and multi-step — Anthropic positions Opus 5.5 for exactly that — or you need the lowest possible price, where Haiku 5.5 costs a twentieth as much. That is the main case for looking at GPT-6.1 Sol instead.
Prompts above 272K input tokens are billed at $4/$15. At launch it was available in ChatGPT Work and Codex, not in regular ChatGPT conversations. Avoid it if you need it inside ordinary ChatGPT chats today, or your prompts regularly pass 272K tokens where the rate doubles. Against Claude Sonnet 5.5 specifically, the two are close enough on capability that price and speed decide it.
Take a moderate workload of 10M input and 2M output tokens a month. Claude Sonnet 5.5 runs $40.00 (at $2/1M in and $10/1M out); GPT-6.1 Sol runs $40.00 (at $2/1M in and $10/1M out). The gap is small enough that price should not decide this one. Output tokens dominate the bill on both, so prompt length matters far less than response length.
Yes, and for most teams that beats picking one. A common split is Claude Sonnet 5.5 for everyday feature work and bug fixing and polished documents at mid-tier pricing, with GPT-6.1 Sol handling agentic coding and computer use when Astra's price is hard to justify. Since Claude Sonnet 5.5 is both the stronger and the cheaper option here, a split mainly makes sense if GPT-6.1 Sol covers a capability you specifically need.