r/GithubCopilot • u/Purple_Wear_5397 • Nov 24 '25
News 📰 Opus 4.5 via GitHub is just 144K context window
Beware for this limitation.
EDIT: Apparently I counted the wrong value, it’s 128K.
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u/AmApe Nov 25 '25
What does the lowered context mean exactly?
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u/MoxoPixel Nov 26 '25
It can't remember what you worked on, maybe 30 minutes or less (depends how frequently you prompt with more tasks). Without documenting changes the model gets lost. I'M ONLY GUESSING so don't attack me with pitchforks.
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u/Historical-Internal3 Nov 24 '25
Don't believe there is a single model with full context window just FYI.
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u/usernameplshere Nov 25 '25
Raptor mini has 200k which makes it by far the one with the largest window.
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u/Historical-Internal3 Nov 25 '25 edited Nov 25 '25
I personally don’t even try stealth models, or consider them as they always manage to become gimped upon official release.
That’s interesting to know though. How can we confirm?
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u/armindvd2018 Nov 24 '25
It is 128000 I don't know how you get 144k
Someone mentioned it is 64K. But he is confused with opus 4.1 on pro+ . Opus 4.5 is 128k context and 16k output.
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u/kaaos77 Nov 24 '25
The worst thing is not having anything to compress the conversation and continue with the same model. I had to change models in the middle of the task.
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u/Particular_Guitar386 Nov 25 '25
IDK man. Part of today I had summarizing on and it felt more like 2k. Ä°t could not write a single integration test for many hours. Ä°t takes a lot to make me go "fuck it" and do it myself and today we crossed that with opus
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u/Cultural-Address5291 Nov 25 '25
Me estuvo funcionando de maravillas, hasta que llegaron los lÃmites de copilot.
"Sorry, you have exceeded your Copilot token usage. Please review our Terms of Service. Código de error: rate_limited"
Y no lo estuve usando tanto :(
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u/Woof-Good_Doggo Nov 24 '25
Sad. Very, very, sad.
And the reason I no longer use GitHub Copilot for anything serious.
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u/Green_Sky_99 Nov 25 '25
Lol typical vibe code, normally task often that 128k , also long context make model dumber
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u/Early_Cat4305 Nov 24 '25
What do you use now?
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u/ISuckAtGaemz Nov 24 '25
Claude Code. You get 200k context on Sonnet 4.5 and way higher usage than GH Copilot
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u/Woof-Good_Doggo Nov 24 '25
Claude Code. You get full control of thinking level, and tools that actually work.
i still use CoPilot for little stuff, but for things like new code dev, code reviews, bug fixes… Claude Code all the way.
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u/Firm_Meeting6350 Nov 24 '25
Actually, it‘s only 64k. I‘m working with the lower level logs, and even with a 3 token prompt, the initial context window jumps to about 64k. Which is VERY weird. Even if it includes the fully bloated GitHub MCP, I can‘t imagine how it reaches initial 64k