Claude 4.6 Opus vs Claude 4.5 Haiku

As you can see in the graph above, while in October, the use of Claude Sonnet 4.5 Thinking was normal, since the 1st of November, Perplexity has deliberately rerouted most if not ALL Sonnet 4.5 and 4.5 Thinking messages to far worse quality models like Gemini 2 Flash and, interestingly, Claude 4.5 Haiku Thinking which are probably cheaper models.

Perplexity is essentially SCAMMING subscribers by marketing their model as "Sonnet 4.5 Thinking" but then having all prompts given by a different model--still a Claude one so we don't realise!

Very scummy.

Anyone else here doing full-stack Next.js in Cursor and watching the Claude quota evaporate before lunch? I used to be in the same boat — massive context windows from all the components, pages, and DB logic would smoke the default limits fast.
Not anymore. I’ve been on this setup for weeks and basically never hit a wall while still getting top-tier answers. Here’s exactly what I do:

**1. .cursorrules is non-negotiable**
I keep one in the root of every project. The key line I added: “Never explain the code to me. Just output the code blocks.”
That single rule saves me thousands of output tokens a day. No more walls of “here’s what I changed and why” — just the goods.

**2. Stopped using Cursor’s built-in Claude quota**
I killed the default Cursor Pro subscription for the heavy stuff. Instead I use my own API keys and point Cursor’s “OpenAI Compatible” base URL at LLM Router Gateway.
Inside [llmrouter](https://llmrouter.app/) routing settings I set up simple tags routing like this:

* **UI & CSS tweaks**: gemini-3.1-flash → gpt-5.4-mini
* **Deep backend / complex logic**: claude-opus-4.6 → deepseek-v3.2
* **General / quick questions**: llama-4-scout

I sorted the fallback chains by speed vs intelligence. The router auto-detects the query type, so 90% of my UI polish and small fixes go to Gemini (basically free + huge context). I only actually hit Claude Opus 4.6 when I’m doing nasty database refactors or tricky architecture stuff. My Anthropic bill dropped \~70% overnight.

**3. Cmd+K for everything small**
Don’t open the full chat sidebar just to rename a variable or extract a component. Highlight the code, hit Cmd+K, let a fast model handle the inline edit. Saves a ton of tokens and feels way snappier.
That’s it. Super simple but it completely changed how much I can actually use Cursor in a day.

How are you all managing the limits? Using a Cursor Team? Or did you build your own router hacks too? Drop your setups — always looking to steal better ideas.

Time and time again I find posts about these fine tunes that promise increased intelligence and reasoning with base models, and I continuously try them, realize they're botched, and delete them shortly after. I sometimes do resort to a lower quant since they are bigger, in this case, a 40b variant of Qwen 3.5 27b, but they seem to always let me down. I've resorted to not downloading any model with "Claude Opus 4.6" in the name.

Kudos to everyone who tries to make the foundation models more intelligent, but imo, it never works.

Note that this example is anecdotal evidence on a single prompt, but it's overall always the case of decreased intelligence when using with a local agent setup + llama.cpp in WSL2. This is irrespective of the quant as well - I've tried many.

One thing to notice however, the reasoning/thinking is significantly less, perhaps that's part of the problem.

Have any you found these better than base, ever?

The attached screenshots are:

./llama-server -hf mradermacher/Qwen3.5-27B-heretic-GGUF:Q4_K_S --temp 1.0 --top-p 0.8 --top-k 20 --min-p 0.00 --fit on --alias default --jinja --flash-attn on --ctx-size 262144 --ctx-checkpoints 256 --cache-ram -1 --cache-type-k q4_0 --cache-type-v q4_0 --threads 8 --threads-batch 16 --no-mmap

./llama-server -hf mradermacher/Qwen3.5-40B-Claude-4.6-Opus-Deckard-Heretic-Uncensored-Thinking-i1-GGUF:i1-Q3_K_S --temp 1.0 --top-p 0.8 --top-k 20 --min-p 0.00 --fit on --alias default --jinja --flash-attn on --ctx-size 131072 --ctx-checkpoints 256 --cache-ram -1 --cache-type-k q4_0 --cache-type-v q4_0 --threads 8 --threads-batch 16 --no-mmap

Also waiting for 27B ? :D

[https://huggingface.co/collections/Jackrong/qwen35-claude-46-opus-reasoning-distilled-v2](https://huggingface.co/collections/Jackrong/qwen35-claude-46-opus-reasoning-distilled-v2)

UPDATE:
Well after some testing, for a small hobby project i found B27 Q6 very capable for local inference in opencode together with [https://github.com/code-yeongyu/oh-my-openagent](https://github.com/code-yeongyu/oh-my-openagent)

Anthropic just dropped Haiku 4.5 and the numbers are wild:

**Performance:**

* 73.3% on SWE-bench Verified (matches Sonnet 4 from 5 months ago)
* 90% of Sonnet 4.5's agentic coding performance
* 2x faster than Sonnet 4
* 4-5x faster than Sonnet 4.5

**Pricing:**

* $1 input / $5 output per million tokens
* That's 66% cheaper than Sonnet 4 ($3/$15)
* \~10x cheaper than Sonnet 4.5 for 90% of the performance

**Why this matters:**

Multi-agent systems are now economically viable. Before Haiku 4.5:

* 10 agents × $15/million = $150/million (too expensive)
* 10 agents × 10s latency = 100s total (too slow)

With Haiku 4.5:

* 10 agents × $5/million = $50/million (3x cheaper)
* 10 agents × 2s latency = 20s total (5x faster)

**Use cases unlocked:**

* Real-time chat assistants (2s response time)
* Automated code reviews (\~$0.01 per review)
* Pair programming with Claude Code (no latency friction)
* Rapid prototyping (iterate as much as you want)

**Available now:**

* Claude.ai
* Claude Code (CLI + extension) - use `/model` command
* API: `model="claude-haiku-4.5-20251015"`
* AWS Bedrock
* Google Cloud Vertex AI

We wrote a deep-dive article (in French, but code examples and benchmarks are universal) with cost analysis, migration guides, and real scenarios: [here](https://cc-france.org/blog/claude-haiku-45-le-modle-qui-redfinit-le-rapport-p)

The barrier between "proof of concept" and "production" just got dramatically lower.

What are you planning to build with it?

Press CTRL+I to invoke Windsurf Command ([documentation)](https://docs.windsurf.com/command/windsurf-overview): this generates code at your cursor, or it edits blocks of text. It never uses any credits.

Also, GPT 5.1 Codex and 5.1 Codex Mini are free in Cascade / chat ([documentation](https://docs.windsurf.com/windsurf/models)).