UPSC Civil Services Prelims Answer Key 2026 [OUT] – Download GS Paper 1 & CSAT PDF, Raise Objection by 31 May at upsc.gov.in

Breaking Update (May 27, 2026): The UPSC Civil Services Prelims Provisional Answer Key 2026 has been released today at upsc.gov.in. The answer key covers both GS Paper 1 and CSAT (GS Paper 2) for the examination held on 24 May 2026. This is a landmark reform — for the first time in UPSC history, the Commission has released the official provisional answer key within days of the exam, not months later. The objection window closes on 31 May 2026 at 6:00 PM through the QPRep portal at upsconline.nic.in.

UPSC Civil Services Prelims Answer Key 2026 – Overview

Detail	Information
Exam Conducted	24 May 2026 (Sunday)
Paper 1 (GS) Timing	9:30 AM – 11:30 AM
Paper 2 (CSAT) Timing	2:30 PM – 4:30 PM
Total Registered Candidates	8,19,372
Estimated Appeared	~5.5 lakh
Total Vacancies (IAS/IPS/IFS)	933
Provisional Answer Key Released	27 May 2026
Objection Deadline	31 May 2026 at 6:00 PM
UPSC Mains 2026	21 August 2026
Official Website	upsc.gov.in
Objection Portal	upsconline.nic.in

UPSC Historic Reform – Answer Key Released Early for First Time

Breaking away from historical operational traditions, UPSC announced a structural paradigm shift for the CSE Prelims 2026 — the Commission will publish the official provisional answer key via its official digital gateway shortly after completion of the preliminary stage. Historically, millions of aspirants waited months for the key, which was only released after final merit list declaration. This change gives every candidate a fair and transparent way to verify their answers and raise objections immediately.

How to Download UPSC Civil Services Prelims Answer Key 2026

1. Visit the official UPSC website — upsc.gov.in
2. Click on “What’s New” tab on the top menu
3. Find the link: “Provisional Answer Key: Civil Services (Preliminary) Examination, 2026”
4. Click on GS Paper 1 or CSAT (GS Paper 2) link
5. A combined PDF for Sets A, B, C and D will download
6. Match your responses against your set to calculate expected marks
7. Download and save immediately — the link may be deactivated after the objection window closes

Direct Links: Available at upsc.gov.in → Examinations → Civil Services (Preliminary) Examination 2026

UPSC Prelims 2026 Marking Scheme – Calculate Your Score

Candidates can calculate projected scores using the prescribed marking metrics — +2 marks for accurate answers and -0.66 marks for wrong answers.

GS Paper 1 (Marks-based — counts for cutoff):

• +2 marks per correct answer
• –0.66 marks per wrong answer
• 0 marks for unattempted questions
• Total: 100 questions × 2 = 200 marks

CSAT Paper 2 (Qualifying only):

• +2.5 marks per correct answer
• –0.833 marks per wrong answer
• Qualifying marks: 66 out of 200 (33%)
• CSAT marks are not counted in the Prelims merit list

Score Formula:

GS Score = (Correct × 2) – (Wrong × 0.66)

Example: 78 correct, 16 wrong → Score = 156 – 10.56 = 145.44 marks

How to Raise Objections Against UPSC Prelims Answer Key 2026

Candidates who disagree with any answer in the provisional key can challenge it through the QPRep portal. The deadline is 31 May 2026 at 6:00 PM — no objections will be accepted after this.

1. Visit upsconline.nic.in and log in with your credentials
2. Navigate to the “Answer Key Representation” or QPRep section
3. Select the question(s) you wish to challenge
4. Upload supporting evidence (textbook reference, official source)
5. Submit before 31 May 2026 at 6:00 PM

All objections will be reviewed by a panel of subject matter experts before the final answer key is published.

UPSC Prelims 2026 Expected Cut-Off – Expert Predictions

Initial student reactions and expert reviews label GS Paper 1 as highly unconventional, lengthy, and one of the toughest papers in the last three years, which experts say could plummet the expected cut-off marks.

Category	Expected Cut-Off 2026	Previous Year (2025) Cutoff
General	82–90 marks	98.34
EWS	78–85 marks	89.34
OBC	78–85 marks	97.68
SC	70–78 marks	82.34
ST	65–75 marks	77.34

Expected cut-offs are based on expert analysis of paper difficulty, number of candidates and vacancies. Official cut-offs will be released after the full recruitment cycle.

UPSC Prelims 2026 – Exam Analysis at a Glance

Paper	Difficulty Level	Key Observation
GS Paper 1	Very High	Unconventional, lengthy questions — toughest in 3 years
CSAT Paper 2	Moderate	Qualifying nature — 33% needed

GS Paper 1 – Subject-wise weightage:

• History: Highest weightage
• Science & Technology: High
• Indian Polity: High
• Environment & Ecology: Moderate
• Economy & Current Affairs: Moderate–High

UPSC Prelims 2026 – Key Dates at a Glance

Event	Date
UPSC CSE Notification 2026	January 2026
Application Closed	February 2026
Admit Card Released	15 May 2026
Prelims Exam Conducted	24 May 2026
Provisional Answer Key Released	27 May 2026
Objection Deadline	31 May 2026 (6:00 PM)
Final Answer Key	After Mains 2026
UPSC Mains 2026	21 August 2026
Prelims Result	Expected June–July 2026

What’s Next After the Answer Key?

Step 1 – Calculate your score using the official answer key at upsc.gov.in and compare with expected category-wise cutoffs.

Step 2 – Raise objections if any answer seems incorrect — deadline is 31 May 2026 at 6:00 PM at upsconline.nic.in.

Step 3 – Begin Mains preparation immediately if your estimated score is above the cutoff — UPSC Mains 2026 is on 21 August 2026. The gap between Prelims and Mains is less than 3 months.

Step 4 – Wait for official Prelims result — expected June–July 2026 on upsc.gov.in.

FAQs

Final Conclusion

The UPSC Civil Services Prelims Answer Key 2026 is officially out at upsc.gov.in. The exam was held on 24 May 2026 for 933 vacancies with over 8.19 lakh registered candidates. GS Paper 1 was rated highly difficult — the toughest in 3 years — meaning the expected cut-off for General category is lower at 82–90 marks. Raise your objections before 31 May 2026 at 6:00 PM at upsconline.nic.in and begin Mains 2026 preparation immediately.

For all exam updates, visit JIS Exams | Official: upsc.gov.in | Objection Portal: upsconline.nic.in