Frontier-quality AI got much cheaper in the second half of 2026. In September, both big labs cut their budget tiers to $0.10 per million input tokens: OpenAI's GPT-6 Luna and Anthropic's Claude Haiku 5.5 cost $0.10/$0.50. One step up, the $2/$10 tier now buys near-flagship work: Claude Sonnet 5.5 and GPT-6.1 Sol, which independent testing puts one point behind GPT-6 Astra. Even the top coding model, Claude Opus 5.5, costs $4/$20 — less than Opus 5 did in July.
The safest frontier AI models default, the cheaper option worth trying first, and the specialist pick — before you read the detail below.
GPT-6.1 Sol is the strongest answer here for frontier AI models — pick it when quality of output matters more than the $2.00/1M/1M input you pay for it.
DeepSeek V4.1 Flash handles the same job for about 88% less per token. Start here and only move up if the output is not good enough.
Claude Haiku 5.5 is the fastest of these for frontier AI models — worth it when latency is what the reader notices, not the last few points of reasoning depth.
GPT-6.1 Sol and Claude Sonnet 5.5 bring near-flagship quality to $2/$10.
Claude Haiku 5.5 and GPT-6 Luna cost $0.10/$0.50 — a fortieth of Claude Opus 5.5's input price.
Open-weight DeepSeek V4.1 Flash (about $0.30/$1.20 hosted) and Qwen 3.8 Flash ($0.15/$0.47) are the cheapest strong open models.
Choose GPT-6.1 Sol or Claude Sonnet 5.5 when quality matters and you want to pay a fifth of frontier prices.
Choose Claude Haiku 5.5 or GPT-6 Luna for high-volume work; watch their long-prompt surcharges.
Choose DeepSeek V4.1 Flash or Qwen 3.8 Flash when you want open weights and the option to self-host later.
Switch the scoring lens to see whether the frontier AI models 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 frontier AI models recommendation shifts once you weigh price or latency differently.
Near-Astra capability at Sol pricing — OpenAI's value pick.
Near-Opus 5.5 quality on scoped work at half the price.
Anthropic's budget model, now with adjustable reasoning, at $0.10/$0.50.
OpenAI's budget tier at half the old price.
DeepSeek's open, cheap new default — V4-Pro now routes to it.
SWE-bench Pro 62.5 at sixteen cents per million input.
List prices and published scores — the numbers this page's pick is built from.
| Model | Input | Output | Est. month | Context | Speed | Coding | Writing | Research |
|---|---|---|---|---|---|---|---|---|
| GPT-6.1 SolOpenAI | $2.00/1M | $10.00/1M | $40 | 1.1M tokens | Balanced | 98 | 94 | 97 |
| Claude Sonnet 5.5Anthropic | $2.00/1M | $10.00/1M | $40 | 1M tokens | Fast | 98 | 98 | 95 |
| Claude Haiku 5.5Anthropic | $0.10/1M | $0.50/1M | $2.00 | 1M tokens | Very fast | 86 | 84 | 82 |
| GPT-6 LunaOpenAI | $0.10/1M | $0.50/1M | $2.00 | 1.1M tokens | Very fast | 84 | 82 | 80 |
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 frontier AI models, what it is genuinely good at, and where we would steer you away from it.
Our pick for frontier AI models. It scores 98/100 on the coding axis we weight this page by, and nothing else in this shortlist matches it on output quality.
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.
Rounds out the shortlist for frontier AI models at 98/100 on coding.
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 frontier AI models. Pick it when turnaround is what your readers or users notice.
Anthropic's budget model, now with adjustable reasoning, at $0.10/$0.50. Full Claude Haiku 5.5 review →
Also worth a look for frontier AI models, at 84/100 on the coding axis.
OpenAI's budget tier at half the old price. Full GPT-6 Luna review →
UseRightAI recommendations are based on practical decision factors people actually feel in day-to-day use.
Newsletter
We email when the frontier AI models 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.
For near-frontier quality, GPT-6.1 Sol and Claude Sonnet 5.5 at $2/$10 per million tokens. For capable budget models, Claude Haiku 5.5 and GPT-6 Luna at $0.10/$0.50. The true frontier tier — GPT-6 Astra and Claude Fable 5.1 — costs $10/$50.
For the right tasks, yes. Claude Haiku 5.5 and GPT-6 Luna handle summarisation, classification, extraction and support replies well. They trail the $2/$10 tier on complex reasoning, long writing and autonomous coding.
Route by difficulty. Send simple tasks to Claude Haiku 5.5 or GPT-6 Luna, everyday quality work to Claude Sonnet 5.5 or GPT-6.1 Sol, and reserve Claude Opus 5.5 or GPT-6 Astra for the few tasks where quality justifies the premium. Prompt caching cuts repeated-context costs further.