A Conversational Question Answering Challenge

What is CoQA?

CoQA is a large-scale dataset for building Conversational Question Answering systems. The goal of the CoQA challenge is to measure the ability of machines to understand a text passage and answer a series of interconnected questions that appear in a conversation. CoQA is pronounced as coca .

CoQA paper

CoQA contains 127,000+ questions with answers collected from 8000+ conversations. Each conversation is collected by pairing two crowdworkers to chat about a passage in the form of questions and answers. The unique features of CoQA include 1) the questions are conversational; 2) the answers can be free-form text; 3) each answer also comes with an evidence subsequence highlighted in the passage; and 4) the passages are collected from seven diverse domains. CoQA has a lot of challenging phenomena not present in existing reading comprehension datasets, e.g., coreference and pragmatic reasoning.


Browse the examples in CoQA:

Download a copy of the dataset in json format:


To evaluate your models, use the official evaluation script. To run the evaluation, use python --data-file <path_to_dev-v1.0.json> --pred-file <path_to_predictions>.

Once you are satisfied with your model performance on the dev set, you submit it to get the official scores on the test sets. We have two test sets, an in-domain set which constitutes the domains present in the training and the dev sets, and an out-of-domain set which constitutes unseen domains (see the paper for more details). To preserve the integrity of the test results, we do not release the test set to the public. Follow this tutorial on how to submit your model for an official evaluation:

Submission Tutorial


CoQA contains passages from seven domains. We make five of these public under the following licenses:

  • Literature and Wikipedia passages are shared under CC BY-SA 4.0 license.
  • Children's stories are collected from MCTest which comes with MSR-LA license.
  • Middle/High school exam passages are collected from RACE which comes with its own license.
  • News passages are collected from the DeepMind CNN dataset which comes with Apache license.


Ask us questions at our google group or at or


We thank the SQuAD team for allowing us to use their code and templates for generating this website.


Human Performance

Stanford University

(Reddy et al. '18)


Oct 06, 2018
FlowQA (single model)

Allen Institute for Artificial Intelligence


Sep 27, 2018
BiDAF++ (single model)

Allen Institute for Artificial Intelligence


Aug 21, 2018
DrQA + seq2seq with copy attention (single model)

Stanford University


Aug 21, 2018
Vanilla DrQA (single model)

Stanford University