Happycapy × Opus 5

Anthropic/Claude Opus 5

Frontier Agentic Coding, at Half the Cost

Anthropic's newest Opus-tier flagship: near-frontier intelligence for complex agentic coding and enterprise work, with a 1M-token context and a cost/capability toggle. Put it to work in your browser, no setup required.

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Trending Claude Opus 5 use cases

The hottest builds from the X community — what people are actually making with Opus 5: 3D worlds, games, simulations, marketing videos, and web design.

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Chetaslua
@chetaslua
97.0K1.1K

A single self-contained HTML 3D audio visualizer driven by a procedurally generated EDM track — music, sound and a black hole all generated with no external assets — showing off Opus 5's Three.js creativity.

Apply to see the full prompt and try it

Please develop a single, self-contained HTML file featuring an extraordinary 3D audio visualizer. The visualizer should be driven by a full-length, highly catchy EDM/dubstep track titled 'SINGULARITY', seamlessly integrating the audio playback with dynamic, high-performance 3D visual effects.

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Harshith
@HarshithLucky3
10.2K122

Opus 5 High nailed a Leonardo da Vinci ornithopter in Three.js from a terse prompt (he even told it to “be lazy”) — a showcase of its 3D generation.

Apply to see the full prompt and try it

leonardo da vinci ornithopter in three js

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Mr. Weirdo
@LeeLinAI123
9.3K170

Deconstructed the iconic Yellow Crane Tower in 3D — an AI-driven, layer-by-layer architectural assembly video built with Opus 5 + Seedance 2.0.

Apply to see the full prompt and try it

Create a 15-second, 16:9 widescreen architectural instructional video showing the step-by-step construction of the Yellow Crane Tower — components translating vertically into place bottom-to-top (podium, columns, tie beams, Dougong bracket sets, rafters, tiles, ridge and finial), one group moving at a time with the active part at full brightness and others dimmed, leader lines and dimension labels tracking each part, a slow camera orbit once assembled, then reversing to the exact initial exploded layout for a seamless loop.

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Chetaslua
@chetaslua
609.5K1.5K

Calls Opus 5 a “3D beast” — a one-shot Three.js scene with a level of detail he says he's never gotten before, even across multiple tries (and notes it's token-hungry).

Build with Opus 5
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BridgeMind
@bridgemindai
178.1K945

Used Opus 5 to generate what he calls the best Remotion marketing video he's seen — clean transitions, music timing locked to the frame, branding nailed unprompted — from one prompt, arguing it outperforms Fable 5 at marketing video.

Build with Opus 5
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Rishi
@0xRishi
99.6K225

Ran an existing Kimi K3-built game through Opus 5 on High mode; a single prompt transformed the whole map, all weapons, and every interactive machine — pack-a-punch, perk machines, mystery box, teleporters — in one shot.

Build with Opus 5
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0xMarioNawfal
@RoundtableSpace
78.5K249

Highlighted a first-person shooter game built with Opus 5 from a single prompt — the kind of one-prompt vibecoding the model is being used for.

Build with Opus 5
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Riley Brown
@rileybrown
68.9K663

Tested Claude's Excel extension with Opus 5: one prompt drove 37 minutes of autonomous research across many public sources into an in-depth NVIDIA analysis.

Build with Opus 5
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@Rubzem
67.2K683

Opus 5 built a Call of Duty-style 5v5 multiplayer shooter from one prompt in about half an hour — with real terrain and enterable buildings, well beyond the flat maps earlier models produced.

Build with Opus 5
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Majid Manzarpour
@majidmanzarpour
63.1K639

Opus 5 built, equipped, rigged and animated a game character in Three.js entirely in code — no external asset pipeline.

Build with Opus 5
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Vj
@play_wallst
57.7K141

Made a complete Three.js game in a single HTML file from one prompt.

Build with Opus 5
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BOOTOSHI 👑
@KingBootoshi
42.2K284

Opus 5 built a tabletop D&D experience in Three.js with an AI game master running local models — and visuals that hold up.

Build with Opus 5
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savip
@savipww
39.7K209

Gave Opus 5 and Fable 5 the exact same task — a 3D Flappy Bird — to compare output and cost head-to-head (Max effort: ~250K tokens/~1 hr on Opus vs ~130K on Fable).

Build with Opus 5
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James Altucher
@jaltucher
38.1K164

Ran Matt Shumer's prompt on Opus 5 for over ten hours and ~1.3M tokens; it produced a full playable game, and he made a video of it with Opus 5 too.

Build with Opus 5
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Ahmed
@ranakabiria
29.9K305

Showed off Opus 5's web-design chops — a polished result from a single prompt.

Build with Opus 5
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Yogi Suria
@suriadesign
21.0K95

Built “Claudepunk 2077,” a cyberpunk Three.js scene, from a single Opus 5 prompt and open-sourced it on GitHub.

Build with Opus 5
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Duoframe | Video Editor & Designer
@Duoframemedia
20.0K209

Produced a finished SaaS ad from a single Opus 5 prompt.

Build with Opus 5
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ZYPHER
@ZypherHQ
18.0K153

One-shot a full game — a “Maccha Chameleon” remake — with every sprite, animation and line of logic as custom code and not a single external asset.

Build with Opus 5
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Anshu
@anshuc
16.8K186

Gave Opus 5 the same space-game prompt he'd tested on Fable; pure Three.js code with no external APIs, assets or skills — and it blew past his expectations.

Build with Opus 5
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Givros
@givros
14.4K120

One-shot an FPS with Opus 5 — every weapon, enemy, mechanic and environment generated from scratch, prompt to playable in under an hour.

Build with Opus 5
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OrcDev
@orcdev
12.8K68

Opus 5 aced his “4 Elements” benchmark, generating an entire 3D world from a single prompt — a result he didn't expect it to reach.

Build with Opus 5
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CHRIS FIRST
@chrisfirst
11.4K150

Opus 5 created a colosseum arcade fighting game from just one prompt.

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Bero.x1
@berrockx1
9.3K91

One-shot an entire “SkySurfer” game with Opus 5 in under 15 minutes for less than $5 — graphics, sound, music and gameplay all real code.

Build with Opus 5
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Tesana - Make games with AI
@TesanaAI
8.7K132

A single prompt produced a game with over 20,000 trees and more than a million blades of grass — no complex game-dev setup required.

Build with Opus 5
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Breeje Anadkat
@BreejeAnadkat
7.1K68

“We might actually be cooked.” Built an impressive interactive demo in one shot with Opus 5.

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Synopsis
@abhinavflac
5.5K54

Ran a chilli-brand website head-to-head: Opus 5 clearly beat Kimi K3 on 3D generation, while Kimi kept the edge on GSAP motion consistency across sections.

Build with Opus 5
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winch
@winchxyz
5.2K41

One prompt delivered a complete single-file WebGL game — runtime-generated everything, real PBR, and atmospheric lore, with zero assets.

Build with Opus 5
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Salio
@Mr_Salio
4.7K36

One-shot a Minecraft-style voxel game with Opus 5 — a playable voxel world with survival mechanics, no retries.

Build with Opus 5
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DegenCalls
@Degen_calls_sol
1.7K20

Opus 5 one-shot a playable game over a four-hour run from a single prompt — everything custom code, no external asset packs.

Build with Opus 5
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Zaki
@ByZakilakbir
93024

Built an entire animation from a single Claude Opus 5 prompt.

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What is Claude Opus 5?

Claude Opus 5 is Anthropic’s newest Opus-tier model, released on July 24, 2026. Anthropic positions it as a thoughtful, proactive model that “comes close to the frontier intelligence of Claude Fable 5 at half the price,” built for complex agentic coding and enterprise work — a step change for the Opus tier that powers long-running agents. It has a 1M-token context window, up to 128K tokens of output, a May 2026 knowledge cutoff, and text & image input.

On Happycapy, Opus 5 isn’t just a chat box. It powers an agent inside a secure cloud sandbox that can write and run code, drive tools, and deliver finished work from a single prompt — with no local setup. Its adaptive thinking and effort controls let you dial cost against capability for each task.

Agentic coding: quality vs. cost

Opus 5 exposes an effort ladder — low, medium, high, xhigh, max — that trades spend for capability. Across three agentic-coding benchmarks, each point is one effort setting; up-and-to-the-left is better (higher score, lower cost per attempt).

Agentic coding by effort level

Frontier-Bench v0.1

05101520253035404550$1.00$1.50$2.00$3.00$5.00$7.00$10.00$15.00$20.00$30.00Score (%)Opus 5Fable 5Opus 4.8GPT-5.6 SolCost per attempt (USD, log scale)Effort ladders (low, medium, high, xhigh, max)

These results are from an internal run of Frontier-Bench v0.1, on the mini-SWE-agent harness and a GKE backend, mean reward over 5 attempts per task. Opus 4.8 served as fallback on safety-classifier refusals for Opus 5 and Fable 5.

Source: Anthropic — Introducing Claude Opus 5

What Claude Opus 5 is best at

Agentic coding & software engineering

Anthropic frames Opus 5 as a step change for the Opus tier on coding and professional work — planning, editing across files, running code, and iterating toward a working result.

Long-running autonomous agents

A 1M-token context and strong tool use let it sustain long, multi-step agent loops without losing the thread — the core use case Anthropic highlights.

Enterprise & professional work

Tuned for reliable, real-world enterprise tasks; Anthropic reports it more than doubles Opus 4.8 on its Frontier-Bench v0.1 eval at a lower cost per task.

Cost / capability control

An effort setting (low → max) plus a Fast mode research preview let you trade speed and spend against depth — near-Fable-5 quality at roughly half the price.

Who is Claude Opus 5 for?

Software engineers & agent builders

Developers running autonomous, multi-file coding loops who want Opus-tier output tuned for agentic work.

Enterprises & teams

Organizations that need dependable, frontier-adjacent intelligence for professional and knowledge work at a controllable cost.

Long-horizon automation

Anyone orchestrating long-running agents and workflows that benefit from a 1M-token context.

Cost-conscious power users

Builders who want near-Fable-5 capability without top-tier pricing, using effort levels to tune spend per task.

Claude Opus 5 FAQ

Who makes Claude Opus 5, and when was it released?+

Claude Opus 5 is made by Anthropic. It was announced on July 24, 2026 as the newest model in the Opus tier, available on the Claude API and apps and through Amazon Bedrock and Google Cloud Vertex AI.

Is Opus 5 Anthropic’s most capable model?+

Not quite — Anthropic’s single most capable widely released model is Claude Fable 5. Opus 5 is positioned just below it as the best-value Opus-tier flagship, described by Anthropic as coming “close to the frontier intelligence of Fable 5 at half the price,” and recommended for complex agentic coding and enterprise work.

How is Opus 5 different from Opus 4.8?+

Anthropic calls Opus 5 a step change for the Opus tier, especially for long-running agents and coding. On its Frontier-Bench v0.1 eval, Anthropic reports Opus 5 more than doubles Opus 4.8’s performance at a lower cost per task, while keeping the same $5 / $25 per-million-token pricing.

How large is Opus 5’s context window?+

Opus 5 has a 1-million-token context window and can produce up to 128K tokens of output (up to 300K via the Batch API), large enough to work across entire codebases and long, multi-file projects.

How much does Claude Opus 5 cost?+

Via the Claude API, Opus 5 is priced at $5 per million input tokens and $25 per million output tokens — the same as Opus 4.8. On Happycapy, Opus 5 is a premium model on paid plans; create a free account to explore the platform first, then upgrade to run it.

Does Opus 5 support extended thinking and effort levels?+

Opus 5 uses adaptive thinking and exposes an effort setting (low, medium, high, xhigh, max) that defaults to high — so you can trade depth against speed and cost per task. A Fast mode research preview runs about 2.5× faster at a higher rate.

How do I run Claude Opus 5 on Happycapy?+

Type your task into the prompt box on this page — the model is already set to Opus 5 — and hit send. Happycapy spins up a secure cloud sandbox and lets Opus 5 build, code, or analyze end-to-end, then delivers the result. No installs or API keys required.

Build with Claude Opus 5 now

Create a free account to explore Happycapy, then upgrade to put Anthropic's newest Opus-tier model to work on real coding, agentic, and enterprise tasks — right in your browser, no setup needed.

Get started for free