Claude Opus 5.5 is the strongest alternative to GPT-6.1 Sol — it scores 100 vs 98 on coding at $4/1M input (GPT-6.1 Sol costs $2/1M). DeepSeek V4-Pro is the budget swap: $0.435/1M input is 78% cheaper. Kimi K3 is the top open-weight option if you want a model you can self-host.
The safest GPT-6.1 sol alternatives default, the cheaper option worth trying first, and the specialist pick — before you read the detail below.
Claude Opus 5.5 is the strongest answer here for GPT-6.1 sol alternatives — pick it when quality of output matters more than the $4.00/1M/1M input you pay for it.
GPT-6.1 Sol handles the same job for about 50% less per token. Start here and only move up if the output is not good enough.
DeepSeek V4-Pro is the fastest of these for GPT-6.1 sol alternatives — worth it when latency is what the reader notices, not the last few points of reasoning depth.
Claude Opus 5.5 beats GPT-6.1 Sol on coding (100 vs 98) at $4/1M input tokens.
DeepSeek V4-Pro cuts input cost by 78% ($0.435 vs $2/1M) while scoring 93/100 on coding.
Kimi K3 is open-weight — self-host it or run it via low-cost API providers at $3/1M input.
Choose Claude Opus 5.5 when you want the closest overall replacement — it targets agentic coding, long-running agents and knowledge work where Opus 5 was the bar.
Choose DeepSeek V4-Pro when token volume matters more than peak quality — it is 78% cheaper on input.
Staying with OpenAI? GPT-6 Astra is the strongest in-house switch at $10/1M input.
Switch the scoring lens to see whether the GPT-6.1 sol alternatives answer changes when cost, speed, or long-document depth leads the decision.
OpenAI / Balanced / Oct 10, 2026
Near-Astra capability at Sol pricing — OpenAI's value pick.
Ranks models by the broadest mix of coding, writing, research, and long-context usefulness.
You need it inside ordinary ChatGPT chats today, or your prompts regularly pass 272K tokens where the rate doubles.
Where the GPT-6.1 sol alternatives recommendation shifts once you weigh price or latency differently.
Near-Astra capability at Sol pricing — OpenAI's value pick.
Anthropic's new coding default — top SWE-bench Pro score at a lower price than Opus 5.
Former DeepSeek flagship — API requests now run on V4.1 Flash.
Closest Chinese challenger to the frontier — #4 overall on intelligence.
OpenAI's frontier answer to Fable 5.1 — computer-use and agentic-coding leader at $10/$50.
Anthropic's highest-ceiling model — strongest on open-ended research; Opus 5.5 now leads coding.
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 Opus 5.5Anthropic | $4.00/1M | $20.00/1M | $80 | 1M tokens | Deliberate | 100 | 97 | 99 |
| GPT-6.1 SolOpenAI | $2.00/1M | $10.00/1M | $40 | 1.1M tokens | Balanced | 98 | 94 | 97 |
| DeepSeek V4-ProDeepSeek | $0.43/1M | $0.87/1M | $6.09 | 1M tokens | Balanced | 93 | 80 | 85 |
| Kimi K3Moonshot | $3.00/1M | $15.00/1M | $60 | 1M tokens | Deliberate | 96 | 90 | 93 |
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 GPT-6.1 sol alternatives, what it is genuinely good at, and where we would steer you away from it.
Ranked first here for GPT-6.1 sol alternatives: 100/100 on coding, with the widest margin of anything in this line-up.
Anthropic's September 22, 2026 Opus — a step up from Opus 5 on agentic coding, long-running agent work and vision, at a lower $4/$20 list price and with fewer tokens spent per finished task.
Your tasks are well-scoped and latency-sensitive — Sonnet 5.5 is half the price and Anthropic says it is the fastest Sonnet yet.
The new premium coding default from Anthropic. Opus 5.5 posts the highest SWE-bench Pro figure in any launch table we track and costs less than Opus 5 did. Fable 5.1 still makes sense for the hardest open-ended research at $10/$50; for almost everything else Opus 5.5 is the better buy, and Sonnet 5.5 at half the price is close behind on well-scoped work.
Full pricing, benchmark table and release notes on the Claude Opus 5.5 page.
The cost-conscious pick for GPT-6.1 sol alternatives, about 50% less per token than Claude Opus 5.5 than the top choice while holding 98/100 on coding.
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.
The fastest model in this shortlist for GPT-6.1 sol alternatives. Pick it when turnaround is what your readers or users notice.
Former DeepSeek flagship — API requests now run on V4.1 Flash. Full DeepSeek V4-Pro review →
Rounds out the shortlist for GPT-6.1 sol alternatives at 96/100 on coding.
Closest Chinese challenger to the frontier — #4 overall on intelligence. Full Kimi K3 review →
UseRightAI recommendations are based on practical decision factors people actually feel in day-to-day use.
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Claude Opus 5.5 is the strongest overall alternative. It scores 100/100 on coding (GPT-6.1 Sol: 98/100) and costs $4/1M input vs $2/1M. Anthropic's new coding default — top SWE-bench Pro score at a lower price than Opus 5.
DeepSeek V4-Pro at $0.435/1M input — 78% cheaper than GPT-6.1 Sol's $2/1M. It scores 93/100 on coding, so expect a quality step down on the hardest tasks.
Yes — Kimi K3 is the strongest open-weight replacement for GPT-6.1 Sol, scoring 96/100 on coding against GPT-6.1 Sol's 98/100. You can self-host it or run it through hosted APIs at $3/1M input (GPT-6.1 Sol costs $2/1M), with no per-seat subscription. Self-hosting trades the licence saving for infrastructure you have to run, so it pays off at sustained volume rather than for occasional use.
GPT-6 Astra — same provider, same API surface, $10/1M input vs $2/1M. OpenAI's frontier answer to Fable 5.1 — computer-use and agentic-coding leader at $10/$50.
OpenAI's best value for serious work.