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# Prompting Claude Opus 5\.5

154 points · 156 comments

[Full discussion](<https://news.ycombinator.com/item?id=49874728>)

[Read original](<https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/prompting-claude-opus-5-5>)

Category: [Models & Products](<https://hacksnap.live/?category=models-products>)

## Skept-o-meter & Hotness

Skept\-o\-meter: High\. Estimated from 10 comments\.

29 comments for the summary\.

Peak rank: \#3

Time in Top 10: 22\.0 hours

Hacksnap ranks recent stories first, then orders each group by points\. Peak rank uses all retained observations\. Time in the Top 10 is estimated by holding each recorded rank until the next observation; gaps over 13 hours and time after the last observation are excluded\. Movement between observations is unknown\.

206 recorded rank observations from 2026\-09\-28T12:02:56\.572048\+00:00 to 2026\-10\-10T23:01:00\.95027\+00:00\.

Hotness — latest 168 recorded Hacksnap ranks:

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Commenters see real Opus 5\.5 gains, especially visual work, but report verbosity, safeguard over\-flagging and rapid prompt churn; this sample is mixed, not consensus\.

## The brief

Anthropic's guide says Claude Opus 5\.5 is faster and more token\-efficient than Opus 5, with stronger agentic coding, knowledge work, communication, visual reading and computer use\. It recommends starting at medium effort, adjusting max\_tokens for thinking, and re\-testing prompts written for thinking\-disabled Opus 5\. It covers unattended agent runs, safeguard refusals, progress updates, multi\-app context exploration, time signals for multiagent harnesses, chat thinking instructions, marking pasted text, visual tools, and frontend design defaults\.

- Opus 5\.5 generates output tokens more than 30% faster than Opus 5 and tends to finish the same task with fewer tokens; existing Opus 5 prompts should perform well without changes\.
- Start at medium effort, set it explicitly, and test levels; effort names don't correspond across models\. Thinking is always on, so max\_tokens must leave room for thinking tokens\.
- Thinking disabled is not accepted; remove reasoning\-in\-response instructions, use summarized thinking, re\-test thinking\-disabled mitigations, and read responses by block type\.
- Unattended agent runs may stop early with text\-only end\_turn; use checklists, continuation messages, completion checks, and stop after two or three automatic continuations\.
- Safeguard refusals cover biology, cybersecurity, and reasoning extraction; classifier declines return stop\_reason refusal and stop\_details, with fallback except for reasoning\_extraction\.
- For visual inputs, re\-test scaffolding; higher\-resolution images and image\-processing tools still help for densest inputs\. Frontend defaults respond to specific patterns to avoid\.

## Discussion themes

Analyzed: 2026\-09\-28T19:39:56\.236516\+00:00

Analysis sample: Based on 29 of 29 usable stored comments. Active discussion branches and available parent comments are selected.

This sample may omit parts of the full thread. Selected themes do not measure community opinion or how common a view is.

### Model\-specific prompting churn

Commenters debate whether per\-model prompt techniques are sustainable; some say models change fundamentally and the race continues, others worry short\-term investment becomes baggage\.

Sources: [Comment 49875126](<https://news.ycombinator.com/item?id=49875126>) · [Comment 49875548](<https://news.ycombinator.com/item?id=49875548>) · [Comment 49875190](<https://news.ycombinator.com/item?id=49875190>) · [Comment 49875587](<https://news.ycombinator.com/item?id=49875587>)

### Verbosity, visibility and session/cache friction

Reports of verbose end\-of\-turn essays, ignored concise style, over\-eager edits, blocking long\-running commands, and poor token\-cache/session awareness\.

Sources: [Comment 49875283](<https://news.ycombinator.com/item?id=49875283>) · [Comment 49875461](<https://news.ycombinator.com/item?id=49875461>) · [Comment 49875600](<https://news.ycombinator.com/item?id=49875600>) · [Comment 49875607](<https://news.ycombinator.com/item?id=49875607>)

### Safeguards, refusals and prompt injection

Discussion of pasted\-text markup, safeguard over\-flagging of own code, refusal to edit security settings, and whether permission refusal is sensible\.

Sources: [Comment 49875367](<https://news.ycombinator.com/item?id=49875367>) · [Comment 49875447](<https://news.ycombinator.com/item?id=49875447>) · [Comment 49876073](<https://news.ycombinator.com/item?id=49876073>) · [Comment 49876610](<https://news.ycombinator.com/item?id=49876610>) · [Comment 49876775](<https://news.ycombinator.com/item?id=49876775>)

### Chinese models and hybrid routing

Commenters suggest DeepSeek/Chinese providers or using a strong model for planning and cheaper model for execution\.

Sources: [Comment 49875239](<https://news.ycombinator.com/item?id=49875239>) · [Comment 49875432](<https://news.ycombinator.com/item?id=49875432>) · [Comment 49875459](<https://news.ycombinator.com/item?id=49875459>) · [Comment 49875484](<https://news.ycombinator.com/item?id=49875484>) · [Comment 49875921](<https://news.ycombinator.com/item?id=49875921>) · [Comment 49875867](<https://news.ycombinator.com/item?id=49875867>)

### Visual capability claims and hype

One commenter says Opus 5\.5 makes detailed 2D/3D visualizations with only JS/TS libraries; another attributes social\-media hype to third\-party APIs and coordination\.

Sources: [Comment 49875112](<https://news.ycombinator.com/item?id=49875112>) · [Comment 49875203](<https://news.ycombinator.com/item?id=49875203>) · [Comment 49875625](<https://news.ycombinator.com/item?id=49875625>)

### Industry pace and developer exhaustion

Commenters describe exhaustion keeping up with rapid model changes and worry that early AI competence may become irrelevant baggage\.

Sources: [Comment 49875112](<https://news.ycombinator.com/item?id=49875112>) · [Comment 49875126](<https://news.ycombinator.com/item?id=49875126>) · [Comment 49875548](<https://news.ycombinator.com/item?id=49875548>) · [Comment 49875587](<https://news.ycombinator.com/item?id=49875587>)

## Sources & coverage

AI-generated summary · 2026\-09\-28T19:39:56\.90899\+00:00

Based on 29 of 29 usable stored comments, selected by depth and branch activity. This is a sample of the discussion. Article text may also be shortened.

Generated using deepseek\-ai/DeepSeek\-V4\.1\-Flash. Check the linked sources for full context.